Subaru Legacy Problems: 4 Issues Every Owner Should Know
2000-2020 model years · Based on 6,490+ owner reports · Last updated March 2026
According to Au7o's analysis of 6,490+ owner reports, the 2000-2020 Subaru Legacy has 4 documented known issues, with 3 rated critical by the Au7o research team. The most serious are EJ25 Head Gasket Failure ($1,600-$3,000 repair), CVT Transmission Failure ($200-$8,000 repair) and FB25 Engine Oil Consumption ($0-$4,500 repair). The most commonly reported issue is EJ25 Head Gasket Failure with 3,800 owner reports. Across all issues, repair costs range from $0 to $8,000. Full technical analysis and DIY maintenance guides at au7o.io.
All 4 Known Issues
The 2.5L EJ25 engine in 2000-2009 Legacys suffers from the same head gasket failure that plagues all EJ25-equipped Subarus. The composite gaskets degrade, causing external oil and coolant leaks at the head-to-block mating surfaces. The Legacy's higher-mileage highway use means many owners encounter this between 80,000-150,000 miles. Phase 1 engines (2000-2005, single overhead cam) are more prone to coolant leaks, while Phase 2 engines (2006-2009, DOHC) tend to leak oil externally first.
Common Symptoms
- External oil seepage at bottom of cylinder heads
- Coolant level gradually decreasing
- Oil and coolant mixing (milky residue on oil cap)
- Overheating at highway speeds
- Sweet smell from engine compartment
- White exhaust smoke in severe cases
How to Fix
Replace both head gaskets with updated MLS (multi-layer steel) gaskets. Use Six Star MLS gasket kit or Subaru OEM MLS (11044AA633 for SOHC, 11044AA770 for DOHC). Machine heads to 0.002-inch flatness. Replace timing belt, tensioner, idlers, water pump, thermostat, and valve cover gaskets while apart. Use Subaru Cooling System Conditioner (SOA635071). Total job is 10-14 hours labor.
What Owners Are Using
Parts and tips from 3,800+ owners who fixed this issue
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The 2010-2016 Legacy 2.5i uses the FB25 engine which is affected by the same oil consumption issue as other FB25-equipped Subarus. Defective piston rings allow excessive oil to bypass into the combustion chamber. The Legacy's higher average speeds mean oil consumption can be even more noticeable during highway driving. Subaru's oil consumption warranty extension and the Oakes v. Subaru settlement cover affected vehicles.
Common Symptoms
- Oil level drops 1+ quart between oil changes
- Low oil warning light
- Blue smoke from exhaust, particularly on cold start
- Oil fouling spark plugs causing misfires
- Catalytic converter premature failure (P0420 code)
How to Fix
Have dealer perform official oil consumption test (OCT). If consumption exceeds 1 qt per 3,000 miles, piston ring replacement or short block replacement is warranted. Check coverage under Subaru powertrain warranty extension (8 years/100,000 miles) or Oakes v. Subaru settlement. Use 0W-20 full synthetic oil and monitor levels weekly.
What Owners Are Using
Parts and tips from 870+ owners who fixed this issue
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The 2010+ Legacy uses the Lineartronic CVT (TR690 for 2.5L, TR580 for 2.5i base) which has widespread reports of premature failure, typically between 80,000-140,000 miles. Failures include chain stretch, torque converter shudder, valve body malfunction, and complete transmission failure. The 2010-2014 models are most affected. Subaru extended CVT warranty coverage to 10 years/100,000 miles. Symptoms often start with subtle judder during light acceleration and progress to complete loss of drive.
Common Symptoms
- Shudder during light throttle acceleration
- Delayed engagement when shifting from Park
- Loud whining from transmission area
- Loss of power under acceleration
- Transmission overheating warning
- Complete loss of forward or reverse gear
How to Fix
Perform CVT fluid exchange with Subaru Lineartronic CVT Fluid II. Apply latest TCM software calibration at dealer. For torque converter shudder, converter replacement ($1,500-2,500) is often sufficient. Full CVT replacement with Subaru remanufactured unit for complete failures. Check 10-year/100,000-mile warranty extension eligibility first.
What Owners Are Using
Parts and tips from 1,100+ owners who fixed this issue
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2010-2019 Legacys develop annoying clunking or rattling from the front suspension, particularly over small bumps, rough roads, and during low-speed turns. The primary causes are worn front stabilizer bar end links and deteriorated strut top mounts. The stabilizer end link ball joints dry out and develop play, while the strut mount bearings wear causing a popping sound during turning. Cold weather exacerbates both issues. This is one of the most common complaints on Legacy forums.
Common Symptoms
- Clunking noise from front end over small bumps
- Rattling on rough road surfaces
- Popping or creaking during low-speed turns
- Noise worse in cold weather
- Vague or loose feeling in steering
How to Fix
Replace front stabilizer bar end links (Subaru 20470AJ000 or Moog K750613). If popping during turns, also replace strut top mounts (Subaru 20320FJ000). End links are a straightforward 30-minute per side DIY job. Strut mount replacement requires spring compressor and is best left to a shop. TSB 18-148-17 addresses front suspension noise on some models.
What Owners Are Using
Parts and tips from 720+ owners who fixed this issue
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Frequently Asked Questions
What are the most common Subaru Legacy problems?
According to Au7o's analysis of 6,490+ owner reports, the 2000-2020 Subaru Legacy has 4 documented issues. The most frequently reported are: EJ25 Head Gasket Failure, CVT Transmission Failure, FB25 Engine Oil Consumption. Of these, 3 are rated critical and should be addressed promptly.
Is the Subaru Legacy reliable?
The 2000-2020 Subaru Legacy has 4 known issues documented across 6,490+ owner reports. 3 issues are rated critical: EJ25 Head Gasket Failure and CVT Transmission Failure and FB25 Engine Oil Consumption. 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 Legacy problems?
Repair costs for known Subaru Legacy issues range from $0 to $8,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, EJ25 Head Gasket Failure, typically costs $1,600-$3,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What year Subaru Legacy is the most reliable?
Reliability varies across model years of the Subaru Legacy. Based on owner reports, issues are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2000-2020 Subaru Legacy with 4 documented issues from 6,490+ owner reports.
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