According to Au7o's analysis of 3,200+ owner reports, the 2013 Subaru Forester has 15 documented known issues, with 5 rated critical. The most serious are FB25 Engine Excessive Oil Consumption ($0-$4,500 repair), Secondary Air Injection Pump Relay Failure — Overheat / Fire Risk (Turbo XT, Recall WTM-73 / NHTSA 16V-738) ($0-$120 repair), Takata Front Passenger Airbag Inflator Rupture Risk (PSAN) — Safety Recall ($0-$0 repair), EJ255 Turbo Piston Ringland Cracking and Engine Failure (Forester XT) ($4,000-$8,000 repair) and Turbo Failure From Clogged Oil-Supply Banjo Bolt Filter (Forester XT, EJ255) ($1,500-$3,500 repair). The most commonly reported issue is FB25 Engine Excessive Oil Consumption with 3,200 owner reports. Across all issues with published estimates, repair costs range from $50 to $8,000. DIY maintenance guides at au7o.io.
Subaru of America, Inc. (Subaru) is recalling certain 2024 Crosstrek, Impreza, 2023-2024 Forester, and 2023 WRX vehicles. The front driveshaft assemblies' outer race may develop cracks and break.
Campaign #23V75400009/11/2023
ENGINE AND ENGINE COOLING
Subaru of America, Inc. (Subaru) is recalling certain 2024 Forester vehicles. The engine water pipe may have loose attachment bolts, allowing the pipe to lose its seal and leak coolant.
Campaign #23V72300026/10/2023
POWER TRAIN:AUTOMATIC TRANSMISSION:PARK/NEUTRAL START INTERLOCK SWITCH
Subaru of America, Inc. is recalling certain model year 2021 Crosstrek, 2022 Forester, 2021-2023 Legacy, and Outback vehicles. An insufficient weld may allow water to enter the inhibitor switch, causing it to fail.
Campaign #23V75500009/11/2023
Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.
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What are the most common Subaru Forester problems?
According to Au7o's analysis of 3,200+ owner reports, the 2013 Subaru Forester has 15 documented issues. The most frequently reported are: FB25 Engine Excessive Oil Consumption, Secondary Air Injection Pump Relay Failure — Overheat / Fire Risk (Turbo XT, Recall WTM-73 / NHTSA 16V-738), Takata Front Passenger Airbag Inflator Rupture Risk (PSAN) — Safety Recall. Of these, 5 are rated critical and should be addressed promptly.
Is the Subaru Forester reliable?
The 2013 Subaru Forester has 15 known issues documented across 3,200+ owner reports. 5 issues are rated critical: FB25 Engine Excessive Oil Consumption and Secondary Air Injection Pump Relay Failure — Overheat / Fire Risk (Turbo XT, Recall WTM-73 / NHTSA 16V-738) and Takata Front Passenger Airbag Inflator Rupture Risk (PSAN) — Safety Recall and EJ255 Turbo Piston Ringland Cracking and Engine Failure (Forester XT) and Turbo Failure From Clogged Oil-Supply Banjo Bolt Filter (Forester XT, EJ255). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Subaru Forester problems?
Repair costs for known Subaru Forester issues range from $0 to $8,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, FB25 Engine Excessive Oil Consumption, typically costs $0-$4,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2011-2018 Subaru Forester FB25 Engine Excessive Oil Consumption?
The 2.5L FB25 engine in 2011-2018 Foresters is widely reported for excessive oil consumption, often burning 1 quart every 1,000-1,500 miles. The root cause is defective piston rings that fail to maintain proper oil control. Subaru acknowledged the issue with TSB 02-157-14R and ex… Repairs typically run $0-$4,500. Severity: high.
What is the 2009-2013 Subaru Forester Secondary Air Injection Pump Relay Failure — Overheat / Fire Risk (Turbo XT, Recall WTM-73 / NHTSA 16V-738)?
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
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On the 2011-2018 Subaru Forester FB25, the 2.5L FB25 engine in 2011-2018 Foresters is widely reported for excessive oil consumption, often burning 1 quart every 1,000-1,500 miles. The root cause is defective piston rings that fail to maintain proper oil control. Subaru acknowledged the issue with TSB 02-157-14R and extended the powertrain warranty to 8 years/100,000 miles for affected vehicles. A class-action settlement (Oakes v. Subaru) covered ring replacement for qualifying owners. The oil consumption test (OCT) required by Subaru involves monitoring oil usage over 3,000 miles at the dealership.
Common Symptoms
Oil level drops significantly between changes
Low oil pressure warning light
Blue or grey smoke from exhaust on startup
Need to add 1+ quart of oil every 1,000-1,500 miles
Burning oil smell from engine bay
How to Fix
Request an oil consumption test (OCT) at a Subaru dealer. If consumption exceeds 1 qt per 3,000 miles, piston ring replacement is warranted. The fix involves replacing all piston rings and sometimes pistons (Subaru part 12006-AB270 short block assembly for severe cases). Check warranty extension and class-action settlement eligibility. Use Subaru 0W-20 synthetic oil and change at 3,000-mile intervals while monitoring.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
maintaining the safe level and performing a controlled consumption test, not repairing worn rings Fitment/availability: Top-off or controlled-test fluid only where the exact Forester owner's manual and test procedure call for 0W-20; conf…
High Confidence3,200 owner reportsLast reported by owners Feb 2026Reviewed Feb 2026
On the 2004-2013 Subaru Forester EJ255 2.5L Turbo, the turbocharged EJ255 has thin, cast-piston ringlands that crack under detonation. The large bore, high cylinder temperatures and a flat oil pan that lets oil slosh away from the pickup under cornering make the engine vulnerable: a single knock event (low-octane fuel, poor tune, hard driving, or oil starvation) can fracture the second ringland. Once cracked, combustion gases blow into the crankcase and oil consumption spikes to roughly a quart every 300-500 miles, with misfires and eventual catastrophic engine failure.
Common Symptoms
Heavy oil consumption (quart per 300-500 miles)
Cylinder misfire and rough running
Blue exhaust smoke
Loss of power / failed leakdown on one cylinder
Engine knock under load
How to Fix
Run only the required premium fuel, change oil on short synthetic intervals, address any knock/detonation immediately, and avoid extended high-boost driving on a stock bottom end. A cracked ringland is confirmed by a leakdown/compression test on the affected cylinder; the repair is a rebuild or replacement of the short block with upgraded forged pistons. Adding an oil-pickup baffle/extended sump helps prevent recurrence.
On the 2009-2013 Subaru Forester EJ255 2.5L Turbo, the turbocharger oil-feed line on the EJ255 uses a banjo (union) bolt containing a fine mesh screen meant to keep debris out of the turbo. As the engine ages or oil-change intervals stretch, sludge and carbon clog the screen and starve the turbo of oil. The turbo bearing then overheats and fails — the shaft can break and the compressor wheel disintegrate, sending metal debris into the oil pan, oil cooler and engine bearings, often destroying the engine. Subaru later deleted the screen on the union bolt because of these clogging-induced failures.
Common Symptoms
Loud whine, whistle or grinding from the turbo
Blue smoke from the exhaust
Sudden loss of boost/power
Knocking or low oil pressure
Metallic debris found in the oil pan or screen
How to Fix
On EJ255 turbo Foresters, proactively remove and clean (or delete, per later Subaru practice) the banjo-bolt oil-supply screen at the turbo oil-feed line and keep to short synthetic-oil intervals. At the first sign of turbo whine, blue smoke, or low oil pressure, inspect the screen and oil-feed line before further driving. A failed turbo requires turbo replacement plus a thorough oil-system flush; if debris reached the bearings, engine teardown may be needed.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Subaru 14445AA090 Turbo Oil-Supply Union Bolt with Screen
correct screened union bolt when inspection finds an obstructed or damaged screen Fitment/availability: 2009-2013 Forester XT EJ255 turbo branch explicitly listed; confirm VIN and feed location Fitment/availability: in stock with Add to …
Genuine Subaru 803910050 Small Turbo Oil-Feed Copper Washer Pair
new sealing washers required when the screened union bolt is serviced Fitment/availability: 2009-2013 Forester XT explicitly listed; two washers supplied, confirm the serviced banjo connection Fitment/availability: in stock with Add to C…
replacement feed pipe only when restricted, damaged or not cleanable Fitment/availability: 2009-2013 Forester 2.5-liter turbo XT catalog branch; confirm VIN Fitment/availability: ships in 1-3 business days with Add to Cart live when revi…
replacement only after turbo failure and its lubrication cause are confirmed Fitment/availability: 2009-2013 Forester XT turbo branch; confirm VIN and current supersession Fitment/availability: ships in 1-3 business days with Add to Cart…
engine oil filter used with the correct oil service after contamination inspection Fitment/availability: Retailer specifies all turbocharged EJ engines, including the 2009-2013 Forester XT EJ255 branch Fitment/availability: in stock with…
On the 2009-2022 Subaru Forester, coil-on-plug ignition coils on the Forester are a common failure point. As the coil's internal epoxy/resin cracks with heat and age, the coil produces erratic or insufficient spark, causing single-cylinder misfires, rough idle, hesitation on acceleration, reduced fuel economy and a flashing/steady check-engine light. A frequently reported pattern is hard starting or stumbling when cold (below roughly 10°F) that improves once the engine warms. Note that a leaking spark plug tube seal (oil in the plug well) can prematurely kill a coil, so the two issues often appear together.
Common Symptoms
Rough idle and vibration at idle
Engine hesitation or stumble on acceleration
Flashing or steady check engine light
Hard starting or misfire when cold
Reduced fuel economy
How to Fix
Pull codes — P0301-P0304 indicate the misfiring cylinder; P0351-P0354 indicate coil circuit faults. Confirm by swapping the suspect coil to an adjacent cylinder; if the misfire follows the coil, replace it (coils cannot be repaired). Inspect the plug well for oil and replace the spark plug tube seal if oil is present so the new coil isn't ruined. Replace the spark plugs at the same time. Forester ignition coil part numbers vary by year/engine (for example 22433AA691 on 2013-2018 2.5L and 22433AA590 on non-turbo 2009-2010); confirm the exact PN by VIN.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Subaru 22433AA590 Ignition Coil
single-cylinder replacement after the coil is proven failed Fitment/availability: 2009-2010 Forester 2.5L naturally aspirated X/X Limited/XS branch only; not XT, confirm VIN Fitment/availability: Add to Cart live when reviewed
single-cylinder replacement after the coil is proven failed Fitment/availability: 2011-2013 Forester 2.5L naturally aspirated X/X Limited/X Premium branch; not XT, confirm VIN Fitment/availability: ships in 1-2 business days with Add to …
single-cylinder replacement after the coil is proven failed Fitment/availability: 2014-2016 Forester 2.5i naturally aspirated branch; current replacement for 22433AA681/AA680, confirm VIN Fitment/availability: ships in 1-2 business days …
single-cylinder replacement after the coil is proven failed Fitment/availability: 2017-2018 Forester 2.5i naturally aspirated branch in this issue; retailer also catalogs XT, confirm VIN Fitment/availability: Add to Cart live when reviewed
single-cylinder replacement after the coil is proven failed Fitment/availability: 2019-2021 Forester Base/Premium/Sport/Limited/Touring branch; confirm VIN and production split Fitment/availability: ships in 1-3 business days with Add to…
On the 2011-2018 Subaru Forester FB25 2.5L, the FB25's hydraulic timing-chain tensioners can bleed down overnight, so on a cold start the chain is momentarily slack and slaps the chain cover/guides, producing a metallic rattle for the first few seconds until oil pressure builds. A brief rattle is common; a rattle that persists 3-4 seconds or grows over time indicates worn tensioners and guides and risks chain skip if ignored. Owners report dealers replacing both tensioners, both chains and all guides on higher-mileage cars.
Common Symptoms
Metallic rattle/clatter for a few seconds at cold start
Rattle that lengthens or worsens over time
Rattle returns after the car sits overnight
Occasional rough running if chain has stretched
Noise reduced after an oil change
How to Fix
Use the correct-grade oil (0W-20) and keep oil fresh; many owners find a brief startup rattle is normal. If the rattle lasts more than ~3 seconds or worsens, have the timing chain tensioners, chains and guides inspected and replaced as a set before a guide breaks or the chain jumps time. Confirm oil pressure and check for sludge that can starve the tensioners.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Subaru 13142AA103 Timing Chain Tensioner
one component of the diagnosed timing repair, not a universal kit or proof of failure Fitment/availability: One tensioner position for retailer-cataloged 2011-2016 Forester 2.5L FB25 applications; confirm VIN, production date, diagram po…
cam-drive chain component only when inspection establishes chain/guide/tensioner replacement Fitment/availability: Retailer-cataloged 2014-2018 Forester FB25 branch in this issue; page states quantity two, but confirm VIN, production dat…
On the 2011-2024 Subaru Forester FB25, the boxer engine's two valve covers face outward and sit low on each side, exposing the cork/rubber valve cover gaskets and the spark plug tube seals to heat cycling and the path of any leaking oil. As these seals harden and shrink, oil seeps out and visibly drips onto the exhaust (burning-oil smell from under the hood) and — more importantly — pools down inside the spark plug tubes. Oil in the plug tubes saturates the plugs, boots and ignition coils, leading to engine misfires, rough idle and a check-engine light. Owners report this on both early FB25s and surprisingly low-mileage newer cars (cases as early as ~17k-50k miles documented on the owners' forum). The valve cover's external location makes the leak a frequent dealer/independent repair.
Common Symptoms
Burning oil smell from engine bay
Oil dripping/residue along the lower side of the engine
Rough idle and engine misfire
Check engine light with cylinder misfire codes
Oil pooled in spark plug wells when coils are removed
How to Fix
Remove the affected valve cover and replace BOTH the valve cover gasket AND the spark plug tube seals at the same time (replacing only the cover gasket and leaving old tube seals lets oil keep reaching the plugs). Inspect and replace any oil-soaked spark plugs and ignition coils. The FB25 valve cover gasket is OEM 13294AA050 (supersedes/cross to 13294AA053); the gasket set that includes the spark plug tube/washer seal is 13293AA051. Clean oil residue off the block and re-torque the cover to spec.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Subaru 13272AA170 Left Valve-Cover Gasket
left cover perimeter gasket when that side is confirmed leaking Fitment/availability: 2011-2018 Forester FB25 left/driver-side branch; confirm VIN and engine Fitment/availability: Add to Cart live when reviewed
Genuine Subaru 13270AA240 Right Valve-Cover Gasket
right cover perimeter gasket when that side is confirmed leaking Fitment/availability: 2011-2018 Forester 2.5-liter naturally aspirated FB25 right/passenger-side branch; confirm VIN Fitment/availability: ships in 1-3 business days with A…
left cover perimeter gasket when that side is confirmed leaking Fitment/availability: Retailer explicitly lists 2019-2025 Forester; use here for the 2019-2024 FB25D left-side branch and confirm VIN Fitment/availability: two left with Add…
Genuine Subaru 13270AA300 Right Valve-Cover Gasket
right cover perimeter gasket when that side is confirmed leaking Fitment/availability: Retailer explicitly lists 2019-2025 Forester; use here for the 2019-2024 FB25D right-side branch and confirm VIN Fitment/availability: two left with A…
On the 2009-2013 Subaru Forester 2.5L EJ255 Turbo, on turbocharged Forester XT models, the relay controlling the secondary air injection (SAI) pump can fail in the closed position, leaving the air pump running continuously. Sustained operation overheats the pump, which can melt surrounding components and create a fire risk even with the vehicle parked. Subaru recalled about 100,000 turbo vehicles (Forester XT, Impreza WRX/STI, Legacy/Outback turbo) for the defect.
Common Symptoms
Burning / melting smell from engine bay
Air pump audibly running after engine warmed up or off
Check engine light with SAI codes
Blown SAI-circuit fuse
How to Fix
Free recall repair under Subaru campaign WTM-73 (NHTSA 16V-738): the dealer replaces the secondary air injection pump relay. If the pump itself was already damaged by prolonged overheating it is replaced as well. Owners of turbo XT models should confirm the recall has been completed by VIN, as completion rates on older vehicles are often incomplete.
On the 2003-2018 Subaru Forester, the wiring that feeds the tailgate runs through a flexible rubber boot between the body and the gate on the passenger side. Every open and close flexes those conductors, and over years the copper work-hardens and fractures inside the insulation, so the wire looks intact from outside. Owners lose several functions at once or intermittently: rear defogger dead, rear wiper not parking or not working, rear gate not locking with central locking, cargo lamp out, backup lights out, and on later cars the backup camera. A chafed conductor shorting to the gate can also blow the brake-light or accessory fuse repeatedly. It is easy to misdiagnose as a failed motor, switch or camera because the affected component tests fine when powered directly.
Common Symptoms
Rear defogger stopped working
Rear wiper dead or will not park
Rear gate will not lock or unlock with central locking
Backup lights or cargo lamp inoperative
Repeatedly blown brake-light fuse
Backup camera intermittently drops out
How to Fix
Pull the rubber grommet/boot at the passenger-side hinge area and flex the loom while probing continuity — broken wires show up right at the bend point. The durable owner-level repair is to cut back each broken conductor, splice with lap solder joints, and cover every joint with heat-shrink, then re-route with a little slack so the flex point moves; that repair is typically about an hour's work. Alternatively replace the rear gate harness (Subaru part 81812AG03C on the applicable years) — the part itself is inexpensive, the labor is the cost. No recall or warranty program covers this wear failure.
On the 2009-2013 Subaru Forester, certain 2009-2013 Foresters are equipped with a Takata-sourced front passenger frontal airbag inflator using non-desiccated phase-stabilized ammonium nitrate (PSAN). Over years of exposure to heat and humidity, moisture intrusion can degrade the propellant so the inflator over-pressurizes and ruptures its metal housing during deployment, spraying shrapnel into the cabin. This is the industry-wide Takata defect that has caused deaths and injuries. Subaru's Forester remedy has been tracked under recall campaigns TKA/TKB/TKC (NHTSA 19V-009 and related), with an interim 'like-for-like' replacement followed by a final non-Takata/desiccated inflator. Only the passenger-side front inflator is affected; the driver front airbag on these Foresters did not use a Takata inflator.
Common Symptoms
No driveability symptom — latent safety defect
Recall notice received by mail / open recall shown on VIN lookup
Risk of inflator rupture and metal shrapnel if passenger airbag deploys in a crash
How to Fix
Free recall repair: the dealer replaces the front passenger airbag module/inflator with a non-Takata (or desiccated) inflator, roughly a 2-hour job. Owners should check their VIN at NHTSA.gov/recalls or Subaru and complete the remedy, including any subsequent final-remedy recall if an interim inflator was installed.
On the 2009-2018 Subaru Forester, forester wheel bearings (both front and rear hub assemblies) fail prematurely, often well before 100,000 miles. The most consistent symptom is a low-pitched grinding, humming or 'airplane' droning noise from the affected corner that grows louder with speed; rear bearing wear is often felt as a vibration under the seats. The noise typically changes pitch or volume during a left/right lane-change maneuver (which distinguishes it from differential whine). Subaru acknowledged a contributing root cause: unevenness/distortion of the bearing backing plate surface affects hub/bearing concentricity after the axle nut is torqued, allowing a 'howling' bearing to develop over time. Water/dirt contamination from failed seals and improper axle-nut torque accelerate the wear. Subaru issued a service bulletin acknowledging the rear bearing/backing-plate concern.
Common Symptoms
Grinding or humming/droning noise from a wheel that gets louder with speed
Noise changes during left/right lane-change maneuvers
Vibration felt under the seats (rear bearing)
Knocking or clunking when cornering
Uneven/inner-edge tire wear
Play when rocking the wheel by hand
How to Fix
Diagnose by lifting the wheel and checking for play/roughness, and by listening for a noise that changes during gentle S-turns at 30-65 mph. The fix is replacement of the complete wheel hub/bearing assembly (sold as a unit). On 2014-2018 Foresters the front complete hub unit is OEM 28473FL040 (supersedes 28473FJ000/28473FJ020); reuse a new self-locking axle nut and torque to spec. Have an alignment checked, as poor alignment and unbalanced tires accelerate bearing failure. Replacing in pairs is common practice.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Subaru 28373FG000 Front Hub and Bearing Assembly
front hub only after the front bearing is localized and confirmed failed Fitment/availability: 2009-2013 Forester front, plus the early-2014 production branch through the catalog split; confirm VIN and side Fitment/availability: Add to C…
Genuine Subaru 28473FG000 Rear Hub Unit, Superseded by 28473FL021
rear hub only after the rear bearing is localized and confirmed failed Fitment/availability: 2009-2013 Forester rear branch; confirm VIN and current 28473FL021 supersession Fitment/availability: ships in 1-2 business days with Add to Car…
Genuine Subaru 28373SC000 Front Hub Unit, Superseded by 28373FL011
front hub only after the front bearing is localized and confirmed failed Fitment/availability: 2014-2018 Forester front branch after the early-2014 production split; confirm VIN and current 28373FL011 Fitment/availability: Add to Cart li…
Genuine Subaru 28473FL040 Rear Hub Unit, Superseded by 28473FL041
rear hub used with the applicable updated backing plate under TSB 05-70-19R Fitment/availability: 2014-2018 Forester rear position only; confirm VIN and current 28473FL041 supersession Fitment/availability: Add to Cart live with current …
left-side companion required by TSB 05-70-19R when repairing that defined rear howling condition Fitment/availability: 2014-2018 Forester left/driver rear, updated backing-plate branch; confirm VIN Fitment/availability: Add to Cart live …
On the 2009-2019 Subaru Forester, the front CV (constant-velocity) axle boots on Foresters crack and tear with age and from suspension flex and road debris. Once the boot splits, grease slings out and dirt/water get in, so the now-dry CV joint wears and produces a clicking or popping that is loudest during tight, low-speed turns. Left unrepaired the joint fails completely, risking loss of drive to that wheel. Owners frequently spot a ring of slung grease on the inner fender or underbody before any noise.
Common Symptoms
Clicking or popping during tight low-speed turns
Grease flung onto the inner fender/underbody
Torn or cracked rubber CV boot
Rhythmic grinding under acceleration when turning
Vibration that worsens with speed (failing joint)
How to Fix
Inspect the inner and outer CV boots at every service for cracks or grease slinging. A freshly torn boot caught early can be re-booted and repacked, but a joint that already clicks needs the CV joint or, more commonly, a complete remanufactured/new front axle assembly (sold per side). Use quality OEM-grade axles; cheap aftermarket axles are a known repeat-failure complaint.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Subaru 28321SC033 Front Drive Shaft Assembly
complete axle after a naturally aspirated-branch joint is confirmed worn or clicking Fitment/availability: 2009-2013 Forester X/X Premium/X Limited/XS naturally aspirated branch, per side; confirm VIN and production supersession Fitment/…
Genuine Subaru 28321SC003 Front Drive Shaft Assembly
complete axle after a turbo-branch joint is confirmed worn or clicking Fitment/availability: 2009-2013 Forester XT turbo branch, per side; confirm VIN and production supersession Fitment/availability: ships in 1-3 business days with Add …
complete axle after a matching CVT-branch joint is confirmed worn or clicking Fitment/availability: 2014-2018 Forester CVT/automatic branch, left or right; verify VIN, transmission and early-2014 production split Fitment/availability: sh…
early repair only for the matching clean, unworn joint before clicking or contamination damage Fitment/availability: Retailer-cataloged 2014-2018 Forester branch; confirm VIN, transmission, joint position and kit contents Fitment/availab…
On the 2011-2021 Subaru Forester FB25, foresters commonly throw a P0420 'Catalyst System Efficiency Below Threshold (Bank 1)' code and an illuminated check-engine light. While the converter itself is the part that degrades, the underlying root cause on FB25 Foresters is frequently the well-documented excessive-oil-consumption defect: burnt oil and unburned fuel coat and contaminate the catalyst, reducing its efficiency until it can no longer pass the downstream O2 sensor's efficiency check. Coolant intrusion and exhaust leaks can produce the same result. Subaru issued a service program (WVI-19/WVI-19R) extending the catalytic converter coverage to 10 years/100,000 miles on certain affected vehicles, and the related Yaeger oil-consumption settlement (2011-2014 models) extended engine warranty to 8 years/100,000 miles.
Common Symptoms
Check engine light with P0420 stored
Failed emissions/smog test
Rotten-egg/sulfur smell from exhaust
Reduced fuel economy
Often paired with excessive oil consumption
How to Fix
Before condemning the converter, rule out cheaper causes: a lazy/failed rear O2 sensor and exhaust leaks can both mimic P0420. Verify the engine is not consuming oil at an excessive rate (a contaminated cat will quickly re-fail if oil consumption is unaddressed). Check VIN eligibility against Subaru service program WVI-19 (10yr/100k extended cat warranty) and the Yaeger oil-consumption settlement before paying out of pocket. If the catalyst is genuinely degraded, replace with a CARB-compliant OEM or direct-fit converter and a new rear O2 sensor.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Subaru 22690AA960 Rear Oxygen Sensor
replacement only after testing confirms the downstream sensor failed or the exact catalyst procedure requires it Fitment/availability: Rear/downstream sensor for retailer-cataloged 2011-2018 Forester 2.5L applications only; confirm VIN a…
replacement only after testing confirms the sensor failed or the exact catalyst procedure requires it Fitment/availability: Rear/downstream sensor for retailer- and Subaru-bulletin-cataloged 2019-2021 Forester 2.5L branch; confirm VIN an…
On the 2009-2018 Subaru Forester, foresters commonly throw front oxygen/air-fuel-ratio sensor heater-circuit codes (P0031 low, P0037 downstream) as the sensors age. The sensors live on the hot exhaust, so the wiring harness near them turns brittle and chafes, and the internal heater element degrades. The result is an illuminated check-engine light, slightly richer/leaner running while the heater is cold, and a guaranteed emissions-test failure. Many owners replace the sensor only to find the real fault is damaged harness wiring at the connector.
Common Symptoms
Check-engine light with P0031 or P0037
Failed emissions/smog test
Slightly reduced fuel economy
Occasional rough cold running
No drivability change in some cases (code only)
How to Fix
Scan and confirm the exact code, then inspect the sensor connector and pigtail for melted, chafed or broken wires before condemning the sensor — repair the harness if damaged. If the heater element itself is open, replace the front air/fuel ratio sensor with the OEM-spec part (Subaru sources Denso/NTK); aftermarket universal sensors often re-trigger the code. Clear codes and verify heater operation.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Subaru 22641AA360 Front Air-Fuel Ratio Sensor
replacement only after P0031/upstream heater or sensor testing confirms failure Fitment/availability: 2009-2010 Forester 2.5L naturally aspirated upstream/front position only; confirm VIN and connector Fitment/availability: Add to Cart l…
Genuine Subaru 22641AA670 Front Air-Fuel Ratio Sensor
replacement only after upstream heater or sensor testing confirms failure Fitment/availability: 2014-2016 Forester 2.5L naturally aspirated upstream/front position only; confirm VIN and connector Fitment/availability: ships in 1-3 busine…
On the 2009-2021 Subaru Forester, foresters are prone to early front brake rotor distortion (thickness variation) that produces a pronounced pulsation/judder felt through the steering wheel and brake pedal when braking, often appearing at relatively low mileage. Owners across multiple generations report warped/judder-prone front rotors, and machining or same-part replacement frequently doesn't last. Subaru has acknowledged brake judder across its lineup with a revised front brake pad material via TSB (e.g. 06-91-24R on related Legacy/Outback/Ascent platforms). A caliper piston or seized slide pin not fully retracting (dragging pad) accelerates the heat cycling that distorts the rotor.
Common Symptoms
Steering wheel and pedal vibration/shudder when braking, especially above 40 mph
Pulsation that returns a few thousand miles after rotors are resurfaced or replaced
Uneven rotor thickness / visible scoring at inspection
Brake judder reappearing prematurely under normal driving
How to Fix
Replace front rotors and pads — ideally with updated-material brake hardware rather than resurfacing the original rotors. Inspect and service the front calipers and slide pins so a dragging piston/pin isn't re-warping the new rotors; use proper torque and an even bed-in procedure.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Subaru 26300SA001 16-inch Front Brake Rotor
front rotor pair after measurements show replacement is required Fitment/availability: 2009-2013 Forester and 2014-2018 2.5i 16-inch front-brake branches; quantity two, confirm VIN and rotor diameter Fitment/availability: ships in 1-3 bu…
Genuine Subaru 26300AG001 17-inch Front Brake Rotor
turbo-branch front rotor pair after measurements show replacement is required Fitment/availability: 2014-2018 Forester 2.0XT 17-inch front-brake branch; quantity two, confirm VIN and diameter Fitment/availability: ships in 1-3 business d…
front rotor pair after measurements show replacement is required Fitment/availability: Retailer-cataloged 2019-2021 Forester front branch; quantity two, confirm VIN, wheel/brake option and whether 26300SJ000 applies instead Fitment/avail…
matched front pad set when this exact early brake branch is confirmed Fitment/availability: Current supersession for retailer-cataloged 2010-2015 Forester branches including 26296SC010; confirm VIN and brake option Fitment/availability: …
matched front pad set for the exact naturally aspirated branch Fitment/availability: 2015-2017 Forester 2.5i naturally aspirated front brakes; confirm VIN and production date Fitment/availability: ships in 1-3 business days with Add to C…
matched front pad set for the 2018 naturally aspirated branch Fitment/availability: 2018 Forester 2.5i naturally aspirated front brakes only; confirm VIN Fitment/availability: ships in 1-2 business days with Add to Cart live when reviewed
matched front pad set for the early SJ turbo branch Fitment/availability: 2014-2015 Forester 2.0XT front-brake branch; confirm VIN and production date Fitment/availability: ships in 1-3 business days with Add to Cart live when reviewed
matched front pad set for the later SJ turbo branch Fitment/availability: 2015-2018 Forester 2.0XT front-brake branch; confirm VIN and 2015 production split Fitment/availability: ships in 1-3 business days with Add to Cart live when revi…
matched front pad set for the confirmed SK brake branch Fitment/availability: 2019-2021 Forester standard 11-inch front-brake branch; confirm VIN, brake package, shims and hardware Fitment/availability: direct product page and VIN-gated …
On the 2009-2018 Subaru Forester, foresters from 2009-2018 develop a persistent clunking or knocking noise from the rear suspension when going over bumps, rough roads, or speed bumps. The cause is worn rear lateral link bushings and rear stabilizer bar end links. The rubber bushings dry out and crack, allowing metal-on-metal contact. The noise is often misdiagnosed as strut or shock failure.
Common Symptoms
Clunking from rear over bumps and rough roads
Hollow knocking sound at low speeds over uneven surfaces
Rear end feels loose or vague in corners
Visible cracking or deterioration of rear suspension bushings
How to Fix
Replace rear lateral link bushings (both inner and outer on each side). Replace rear stabilizer bar end links. Whiteline polyurethane bushings are a popular upgrade that lasts significantly longer than OEM rubber. If noise persists, check rear subframe mounting bushings. Torque all bolts to spec with the suspension loaded (wheels on ground or suspension compressed to ride height).
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Subaru 20250FG021 Rear-Suspension Front Lateral Link
front-position rear lateral link after that link or its installed bushings are confirmed faulty Fitment/availability: 2009-2018 Forester rear suspension, front lateral-link position; same part left/right, quantity two only if both fail, …
rear-position lateral link after failure is confirmed Fitment/availability: 2010-2013 Forester rear-position lateral link branch; source's 2009-2012 note was corrected, confirm VIN/current 20250AJ040 and quantity Fitment/availability: sh…
rear-position lateral link after failure is confirmed Fitment/availability: 2013-2016 Forester rear-position lateral-link branch; confirm VIN/build overlap and quantity Fitment/availability: ships in 1 business day with Add to Cart live …
rear-position lateral link after failure is confirmed Fitment/availability: 2017-2018 Forester rear-position lateral-link branch; same part left/right, confirm VIN and quantity Fitment/availability: ships in 1-3 business days with Add to…
OE rear end link after play or boot/joint failure is confirmed Fitment/availability: 2009-2018 Forester rear stabilizer link; same part left/right, confirm VIN and replace only failed side or pair as condition warrants Fitment/availabili…
alternative end-link pair after the original links are diagnosed faulty or an adjustable-bar setup requires them Fitment/availability: Retailer lists 2009-2018 Forester trims in this issue; adjustable performance alternative with possibl…
On turbocharged Forester XT models, the relay controlling the secondary air injection (SAI) pump can fail in the closed position, leaving the air pump running continuously. Sustained operation overheats the pump, which can melt surrounding components and create a fire risk even w… Repairs typically run $0-$120. Severity: high.
What is the 2009-2013 Subaru Forester Takata Front Passenger Airbag Inflator Rupture Risk (PSAN) — Safety Recall?
Certain 2009-2013 Foresters are equipped with a Takata-sourced front passenger frontal airbag inflator using non-desiccated phase-stabilized ammonium nitrate (PSAN). Over years of exposure to heat and humidity, moisture intrusion can degrade the propellant so the inflator over-pr… Repairs typically run $0-$0. Severity: high.
What is the 2004-2013 Subaru Forester EJ255 Turbo Piston Ringland Cracking and Engine Failure (Forester XT)?
The turbocharged EJ255 has thin, cast-piston ringlands that crack under detonation. The large bore, high cylinder temperatures and a flat oil pan that lets oil slosh away from the pickup under cornering make the engine vulnerable: a single knock event (low-octane fuel, poor tune,… Repairs typically run $4,000-$8,000. Severity: high.
What is the 2009-2013 Subaru Forester Turbo Failure From Clogged Oil-Supply Banjo Bolt Filter (Forester XT, EJ255)?
The turbocharger oil-feed line on the EJ255 uses a banjo (union) bolt containing a fine mesh screen meant to keep debris out of the turbo. As the engine ages or oil-change intervals stretch, sludge and carbon clog the screen and starve the turbo of oil. The turbo bearing then ove… Repairs typically run $1,500-$3,500. Severity: high.
What is the 2009-2018 Subaru Forester Premature Front and Rear Wheel Bearing/Hub Failure (Faulty Backing Plate Design)?
Forester wheel bearings (both front and rear hub assemblies) fail prematurely, often well before 100,000 miles. The most consistent symptom is a low-pitched grinding, humming or 'airplane' droning noise from the affected corner that grows louder with speed; rear bearing wear is o… Repairs typically run $250-$600. Severity: medium.
What is the 2009-2019 Subaru Forester Front CV Axle Boot Tearing and Grease Leak Causing Clicking on Turns?
The front CV (constant-velocity) axle boots on Foresters crack and tear with age and from suspension flex and road debris. Once the boot splits, grease slings out and dirt/water get in, so the now-dry CV joint wears and produces a clicking or popping that is loudest during tight,… Repairs typically run $200-$600. Severity: medium.
What is the 2011-2021 Subaru Forester Catalytic Converter Efficiency Failure (P0420) — Often Triggered by Oil-Burning Contamination?
Foresters commonly throw a P0420 'Catalyst System Efficiency Below Threshold (Bank 1)' code and an illuminated check-engine light. While the converter itself is the part that degrades, the underlying root cause on FB25 Foresters is frequently the well-documented excessive-oil-con… Repairs typically run $200-$2,200. Severity: medium.
What is the 2009-2022 Subaru Forester Ignition Coil Failure Causing Misfire and Hard Cold-Weather Starting?
Coil-on-plug ignition coils on the Forester are a common failure point. As the coil's internal epoxy/resin cracks with heat and age, the coil produces erratic or insufficient spark, causing single-cylinder misfires, rough idle, hesitation on acceleration, reduced fuel economy and… Repairs typically run $60-$350. Severity: medium.
What is the 2009-2021 Subaru Forester Premature Front Brake Rotor Warping / Brake Judder — Steering-Wheel Shudder When Braking?
Foresters are prone to early front brake rotor distortion (thickness variation) that produces a pronounced pulsation/judder felt through the steering wheel and brake pedal when braking, often appearing at relatively low mileage. Owners across multiple generations report warped/ju… Repairs typically run $300-$700. Severity: medium.
What is the 2011-2018 Subaru Forester FB25 Timing Chain Tensioner Cold-Start Rattle?
The FB25's hydraulic timing-chain tensioners can bleed down overnight, so on a cold start the chain is momentarily slack and slaps the chain cover/guides, producing a metallic rattle for the first few seconds until oil pressure builds. A brief rattle is common; a rattle that pers… Repairs typically run $800-$2,200. Severity: medium.
What is the 2011-2024 Subaru Forester Valve Cover Gasket and Spark Plug Tube Seal Oil Leak Causing Misfires (FB25)?
The boxer engine's two valve covers face outward and sit low on each side, exposing the cork/rubber valve cover gaskets and the spark plug tube seals to heat cycling and the path of any leaking oil. As these seals harden and shrink, oil seeps out and visibly drips onto the exhaus… Repairs typically run $250-$700. Severity: medium.
What is the 2009-2018 Subaru Forester Rear Suspension Bushing Clunk Over Bumps?
Foresters from 2009-2018 develop a persistent clunking or knocking noise from the rear suspension when going over bumps, rough roads, or speed bumps. The cause is worn rear lateral link bushings and rear stabilizer bar end links. The rubber bushings dry out and crack, allowing me… Repairs typically run $300-$800. Severity: low.
What is the 2009-2018 Subaru Forester Front Air/Fuel Ratio (Wideband O2) Sensor Heater Circuit Failure — P0031/P0037?
Foresters commonly throw front oxygen/air-fuel-ratio sensor heater-circuit codes (P0031 low, P0037 downstream) as the sensors age. The sensors live on the hot exhaust, so the wiring harness near them turns brittle and chafes, and the internal heater element degrades. The result i… Repairs typically run $150-$450. Severity: low.
What is the 2003-2018 Subaru Forester Rear Gate Wiring Harness Wires Fracturing in the Flex Conduit — Rear Wiper, Defogger, Lock and Backup Lights Fail?
The wiring that feeds the tailgate runs through a flexible rubber boot between the body and the gate on the passenger side. Every open and close flexes those conductors, and over years the copper work-hardens and fractures inside the insulation, so the wire looks intact from outs… Repairs typically run $50-$450. Severity: low.
