Audi A5 Problems: 7 Issues Every Owner Should Know
2008-2023 model years · Based on 0+ owner reports · Last updated March 2026
According to Au7o's analysis of 0+ owner reports, the 2008-2023 Audi A5 has 7 documented known issues, with 1 rated critical by the Au7o research team. The most serious is Timing Chain Tensioner Failure (2.0 TFSI Engine) ($2,000-$10,000 repair). Across all issues, repair costs range from $0 to $10,000. Full technical analysis and DIY maintenance guides at au7o.io.
All 7 Known Issues
The B8/B8.5 A5 with the 2.0 TFSI engine (2008-2016) suffers from premature timing chain tensioner failure, identical to the A4 and A6. The tensioners wear out between 60,000-120,000 miles, causing the timing chain to stretch and rattle. A loud rattling noise on cold start from the front of the engine is the classic warning sign. If ignored, the timing chain can jump timing or break, causing catastrophic valve-to-piston contact and destroying the engine. Early B8 models (2008-2012) are more prone to failure than later B8.5 models (2013-2016). A5OC forum members report many failures under 100,000 miles, with some owners experiencing complete engine destruction. The repair requires removing the front of the engine and costs $2,000-$5,000. Some owners report oil consumption issues leading to accelerated tensioner wear.
Common Symptoms
- Loud rattling or clattering noise from front of engine on cold start
- Metallic rattling that disappears after 10-30 seconds of warm-up
- Check engine light with timing correlation codes (P0016, P0017, P0087)
- Rough idle or misfires
- Engine won't start (if chain has jumped)
- Catastrophic engine damage if chain breaks (bent valves, destroyed pistons)
How to Fix
PREVENTIVE REPLACEMENT: Replace timing chain, tensioners, and guides at 80,000-100,000 miles BEFORE rattling starts ($2,000-$3,000). If rattling has already begun, DO NOT delay—chain can jump at any moment. Repair requires removing front engine cover, water pump, and thermostat. Labor is 8-12 hours. Use ONLY OEM Audi parts—aftermarket tensioners fail quickly. Change oil every 5,000 miles and check oil level weekly to prevent accelerated wear. If catastrophic failure occurs, engine replacement ($6,000-$10,000) may be more cost-effective than rebuild.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- UpgradeUse ONLY the latest OEM revised tensioner 06K109467K which supersedes all previous revisions. Aftermarket tensioners have high failure rates per Audizine B8 A5 threads. (Genuine VW/Audi #06K109467K)
- UpgradeAlways do complete timing chain kit: chain + tensioner + upper/lower guides. INA is the OEM manufacturer (part 711024410). FCP Euro and ECS Tuning carry complete kits for $800-$1,200. (INA #711024410)
- TipReplace preventively at 80,000-100,000 miles. The 2008-2012 B8 A5 2.0T is especially prone. Cold-start rattle is the warning sign - do not delay once heard.
- NoteCatastrophic timing chain failure destroys the engine. If you hear ANY cold-start rattle, stop driving hard and schedule replacement within weeks, not months.
- UpgradeBuy from FCP Euro for lifetime replacement warranty on all parts - if chain components ever need replacing again, you get free parts. (FCP Euro Lifetime Warranty Parts)
The 2.0 TFSI engine in early B8 A5 models (2008-2015) suffers from excessive oil consumption due to defective piston ring design. Owners report burning 1 quart of oil every 500-1,200 miles, requiring constant top-ups. The issue is worst in 2010-2012 models with EA888 Gen 2 engines. Faulty oil control rings fail to scrape oil from cylinder walls, allowing it to burn in the combustion chamber. This causes blue smoke on startup, fouled spark plugs, and carbon buildup. Low oil levels starve the turbocharger and timing chain tensioners, leading to expensive failures. Audi extended warranty coverage for some models and performed piston ring replacements under warranty. A5OC forums report many owners going through 5+ quarts between oil changes. Some cases cause cylinder scoring requiring engine replacement.
Common Symptoms
- Low oil warning light frequently (need to add oil between changes)
- Burning 1+ quarts of oil every 1,000 miles
- Blue or gray smoke from exhaust on startup or hard acceleration
- Fouled spark plugs (oil-soaked)
- Check engine light with misfire codes (P0300-P0304)
- Rough idle from carbon buildup
- Turbo whining (from oil starvation)
How to Fix
For SEVERE consumption (over 1 qt/1,000 mi): Piston ring replacement or short block replacement ($4,000-$7,000). Check Audi's extended warranty program for 2009-2015 models—some repairs covered. For MODERATE consumption: Replace PCV valve ($150), clean carbon deposits with walnut blasting ($800), and switch to thicker oil (5W-40 instead of 5W-30). PREVENTION: Check oil level WEEKLY, change oil every 5,000 miles (NOT 10,000), and avoid 2010-2012 models when buying used. 2015+ Gen 3 EA888 engines have updated rings and are far more reliable.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- UpgradeRevised pistons with "Big Wave" oil control ring design are the definitive fix for severe consumption (1qt/500-1200mi). (Kolbenschmidt #06H107065DD)
- UpgradeStage 1 fix: replace PCV diaphragm with Dorman 917-064 repair kit ($25-35) before committing to piston replacement. (Dorman #917-064)
- TipGen2 EA888 (2008-2013 B8 A5) is most affected. Check eligibility for class action settlement covering piston replacement.
- NoteRunning low on oil can destroy the turbocharger and rod bearings. Check oil level weekly and carry a quart in the trunk until the issue is fixed.
- TipUse Liqui Moly Molygen 5W-40 or Castrol Edge 5W-40 with 5,000-mile oil change intervals to help manage consumption.
All direct-injection engines in the A5 and S5 (2.0 TFSI, 3.0T, and 3.2L V6) suffer from severe carbon buildup on intake valves. In direct-injection engines, fuel sprays directly into the cylinder, bypassing the intake valves. This means intake valves are only exposed to oil vapors from the PCV system, which bake onto the valve backs as hard carbon deposits. Over 60,000-100,000 miles, carbon restricts airflow, causing rough idle, misfires, hesitation, and power loss. The 3.0T supercharged S5 is particularly susceptible due to higher oil vapor pressure. In severe cases, carbon deposits prevent valves from seating properly, causing compression loss and valve damage. The ONLY effective fix is walnut blasting—blasting crushed walnut shells through the intake to remove carbon. A5OC forums recommend this as preventive maintenance every 60,000 miles.
Common Symptoms
- Rough or unstable idle (engine shakes at stoplights)
- Hesitation or stumbling on acceleration
- Reduced power and sluggish throttle response
- Poor fuel economy (2-4 MPG drop)
- Check engine light with misfire codes (P0300-P0306)
- Engine runs rough when cold, smooths out when warm
- Hard starting or extended cranking
How to Fix
WALNUT BLASTING: Remove intake manifold and blast crushed walnut shells through intake ports to remove carbon ($700-$1,200). Requires specialized equipment—DIY not recommended unless experienced. Dealers charge $1,200-$1,800; independent Audi shops charge less. Repeat every 60,000-80,000 miles as preventive maintenance. PREVENTION: Install catch can ($300-$500) to filter PCV oil vapors before they reach intake valves—extends cleaning interval to 100k+ miles. Add Liqui Moly Intake Valve Cleaner to every oil change ($15). Perform "Italian tune-up" monthly (spirited highway driving to high RPM).
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- Upgrade034 Motorsport Catch Can Kit (034-101-1010) is the most complete prevention solution for B8/B8.5 A5 2.0T. Replaces factory PCV with billet aluminum breather plate. (034 Motorsport #034-101-1010)
- TipWalnut blasting every 40,000 miles is the community-recommended cleaning interval. DIY cost under $200 with Harbor Freight media blaster and walnut shell media.
- UpgradeMishimoto Baffled Oil Catch Can is a universal alternative if 034 kit is unavailable for your specific year. Requires custom bracket fabrication. (Mishimoto Baffled Oil Catch Can (Universal))
- NoteSymptoms include rough idle, misfires, and progressive power loss. By 60,000 miles, valves can be severely caked. Do not wait until symptoms are severe.
- TipAfter walnut blasting, install a catch can immediately to prevent rapid re-accumulation. Without a catch can, carbon will return to the same level within 30,000-40,000 miles.
Water pump failures are common across all A5 and S5 generations due to plastic impeller degradation and seal leaks. Audi uses plastic impellers that crack or disintegrate over time (typically 80,000-120,000 miles), causing coolant leaks and overheating. The water pump is timing belt/chain driven in many models, so replacement during timing service saves labor. Thermostat housings also crack from heat cycling, causing coolant leaks and erratic temperature readings. Symptoms include coolant puddles under the car, overheating in traffic, and temperature gauge fluctuations. Ignoring a failed water pump can cause severe engine overheating, warped cylinder heads, and blown head gaskets ($3,000-$5,000). The 3.0T S5 also has an electric auxiliary water pump for turbo cooling that fails separately.
Common Symptoms
- Coolant leak under front of car (pink/green puddle)
- Overheating in stop-and-go traffic or at idle
- Temperature gauge rising above normal (middle position)
- Coolant warning light or low coolant message
- No heat from cabin heater (auxiliary pump failure on S5)
- Hissing or gurgling noise from engine bay
- Steam or coolant smell from engine
How to Fix
Replace water pump AND thermostat together ($800-$1,500). Use OEM or high-quality aftermarket parts (Rein, Hepu, Meyle)—cheap pumps fail within 20k miles. If water pump is timing chain-driven, replace during timing service to save labor. Flush cooling system and refill with OEM Audi G12++ or G13 coolant (do NOT mix types). Inspect hoses and replace if cracked. S5 owners: Replace auxiliary electric water pump separately if heater fails ($300-$600). Monitor coolant level weekly and address leaks immediately.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- UpgradeUse latest OEM thermostat housing revision 06L121111P for Gen3, or Hepu P672 as a cost-effective German OEM-supplier alternative. (Genuine VW/Audi #06L121111P)
- UpgradeUSP Motorsports metal impeller upgrade kit eliminates the factory plastic impeller heat-deformation failure mode. (USP Motorsports #06L121111H-KT1)
- NoteAVOID Graf water pumps - multiple Audizine members report leaking from installation. Stick with OEM or Hepu.
- TipReplace water pump, thermostat housing, and union as a complete assembly. Also replace heater pipe O-ring N90365302 to prevent post-repair leaks.
The 3.0T supercharged V6 in the S5 (2010-2017) uses an electromagnetic clutch to engage the supercharger. Over time, the clutch disc wears out or the torsional isolator (damper) within the supercharger snout fails, creating a loud rattling, grinding, or "bag of marbles" sound from the front of the engine. This is most noticeable on cold starts or under load. The supercharger clutch engages and disengages based on throttle input, and repeated cycling wears the friction material. A failed clutch prevents the supercharger from engaging, causing significant power loss (feels like a naturally aspirated V6). A failed isolator damages internal supercharger components, requiring complete supercharger replacement ($3,000-$5,000). AudiWorld and A5OC forums report failures between 60,000-120,000 miles. Some dealers refuse warranty claims, calling it "wear and tear."
Common Symptoms
- Loud rattling, grinding, or "marbles in a can" noise from front of engine
- Noise most noticeable on cold start or light throttle
- Loss of power (feels slower than expected for S5)
- Check engine light with underboost codes (P0234, P0299)
- Supercharger whine disappears (clutch not engaging)
- Belt squeal or chirp from supercharger pulley
- Metal debris in oil (severe cases)
How to Fix
If caught EARLY (noise but no power loss): Replace supercharger clutch ($1,200-$2,000 with labor). Clutch can be replaced without removing supercharger. If SEVERE (grinding + power loss): Replace complete supercharger assembly ($3,000-$5,000 installed). Some rebuilders offer rebuilt superchargers for $2,000-$2,500. PREVENTION: Service supercharger oil every 40,000 miles (Audi says "lifetime" but it's not). Use high-quality synthetic oil and change every 5,000 miles. Avoid aggressive launches and excessive boost—gentle driving extends clutch life. Budget for this repair if buying a used S5.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- UpgradeJHM Motorsports complete supercharger seal & gasket kit includes new pocket bearings and supercharger oil. Fits B8/B8.5 S4/S5/Q5/SQ5 and C6/C7 A6/A7 3.0T. (JHM Motorsports Supercharger Seal & Gasket Kit)
- UpgradeJon Bond Performance full TVS1320 rebuild kit includes 2x INA rear needle bearings (pre-greased), Permatex gasket maker, and JB Performance supercharger oil with Tribodyn. (Jon Bond Performance TVS1320 Full Rebuild Kit)
- UpgradeFor a complete upgrade, JHM Motorsports offers a fully ported TVS1320 supercharger with new bearings. Significant power gains over stock. (JHM Motorsports Fully Ported TVS1320 Supercharger)
- TipProfessional rebuild services available from Superchargers Online (818-518-9889) and Jokerz Performance. Cost is typically $800-$1,500 for rebuild vs $3,000-$5,000 for OEM replacement.
- NoteWhining noise from the supercharger area that increases with RPM is the classic sign of nose bearing failure. Address immediately - continued driving can damage the rotors and require full replacement.
The B9 A5 (2018-2020 Coupe, Sportback, and Cabriolet) has a design flaw where the electrical connection for the Occupant Detection System (ODS) in the front passenger seat can loosen over time. This causes the ODS control module to malfunction and incorrectly deactivate the front passenger airbag, even when an adult is seated. If the airbag is deactivated, it will NOT deploy in a crash, putting the passenger at serious risk of injury or death. The dashboard displays "AIRBAG OFF" indicator when this occurs. Audi issued RECALL 69CN (NHTSA 20V-354) affecting 208,332 vehicles. The issue is caused by vibration loosening the electrical connector under the seat. Dealers inspect and secure the connection for free.
Common Symptoms
- "AIRBAG OFF" indicator illuminated with adult passenger seated
- Passenger airbag warning light on dashboard
- ODS fault codes in vehicle diagnostics
- Intermittent airbag light (comes and goes)
- No symptoms until crash (airbag fails to deploy)
How to Fix
This is covered under RECALL 69CN (NHTSA 20V-354). Contact your Audi dealer immediately to schedule free recall repair. The dealer will inspect the ODS electrical connection under the front passenger seat, secure the connector, and verify proper operation. If the control module is damaged, Audi replaces it for free. DO NOT attempt DIY repair—this is a safety-critical system. Check your VIN at Audi's recall website to confirm if your vehicle is affected. Recall repair takes 1-2 hours.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- NoteThis is a SAFETY RECALL - contact your Audi dealer immediately for free repair. The front passenger airbag may not deploy in a crash due to ODS sensor malfunction.
- TipCheck recall status at NHTSA.gov with your VIN or call your Audi dealer directly. Recall repairs are always free of charge regardless of mileage or warranty status.
- NoteDo not attempt to repair airbag systems yourself. Improper handling of SRS components can cause accidental deployment or system malfunction.
- TipIf your airbag warning light is illuminated, have the system scanned at the dealer. Multiple B9 A5 owners on Audizine reported the light coming on before being notified of the recall.
The B9 A5 (2017-2023) experiences various electrical gremlins, most commonly with the MMI infotainment system. The touchscreen freezes, reboots randomly, displays black screen, or becomes unresponsive. Owners also report interior trim rattles and squeaks from the dashboard, door panels, and center console. Other issues include backup camera failures, parking sensor malfunctions, wireless charging pad not working, and Android Auto/Apple CarPlay connectivity problems. Some models experience battery drain from parasitic draw. While frustrating, most electrical issues are minor annoyances rather than safety concerns. Audi issued software updates to address some infotainment bugs. A5OC forums report mixed results—some updates help, others don't. Build quality seems inconsistent across production runs.
Common Symptoms
- MMI touchscreen freezes or becomes unresponsive
- Infotainment system reboots randomly while driving
- Black screen on startup (system won't boot)
- Backup camera shows "No Signal" or black screen
- Rattling or creaking noises from dashboard/door panels
- Android Auto/Apple CarPlay disconnects randomly
- Wireless charging pad doesn't charge phone
- Battery dies after car sits for 3-4 days
How to Fix
Infotainment issues: Perform MMI hard reset (hold power + volume up for 10 seconds). If that fails, dealer can update software ($0-$150). Persistent issues may require MMI unit replacement ($1,500-$2,500). Interior rattles: Dealer can apply felt tape or foam to trim panels under warranty. Out-of-warranty DIY fixes involve removing panels and adding foam tape. Backup camera: Check for software update first, then camera replacement ($400-$800). Battery drain: Dealer performs parasitic draw test to identify faulty module. Android Auto/CarPlay: Use high-quality USB cable (cheap cables cause disconnects). For wireless charging, clean phone case and pad.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- TipFor MMI freezing and black screen issues, try a hard reset: hold the rotary power/volume knob for 30+ seconds until the system reboots. This resolves most temporary glitches.
- TipKeep MMI firmware updated through your Audi dealer or via the myAudi app. Many B9 infotainment bugs were addressed through software updates in 2019-2020.
- UpgradeVirtual Cockpit display failures require instrument cluster replacement. OEM refurbished units available from ECS Tuning at significant savings vs new from dealer ($800-$1,200 vs $2,000+). (Genuine VW/Audi Virtual Cockpit Instrument Cluster (Refurbished))
- NoteAftermarket stereo replacements void the warranty on the entire MMI system. If still under warranty, pursue dealer repair first.
Frequently Asked Questions
What are the most common Audi A5 problems?
According to Au7o's analysis of 0+ owner reports, the 2008-2023 Audi A5 has 7 documented issues. The most frequently reported are: Timing Chain Tensioner Failure (2.0 TFSI Engine), Excessive Oil Consumption (2.0 TFSI Engine), Supercharger Clutch and Isolator Failure (3.0T V6). Of these, 1 is rated critical and should be addressed promptly.
Is the Audi A5 reliable?
The 2008-2023 Audi A5 has 7 known issues documented across 0+ owner reports. 1 issue is rated critical: Timing Chain Tensioner Failure (2.0 TFSI Engine). 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 Audi A5 problems?
Repair costs for known Audi A5 issues range from $0 to $10,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Timing Chain Tensioner Failure (2.0 TFSI Engine), typically costs $2,000-$10,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What year Audi A5 is the most reliable?
Reliability varies across model years of the Audi A5. 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 2008-2023 Audi A5 with 7 documented issues from 0+ owner reports.
Get DIY Repair Guides for Your Audi A5
AI-powered step-by-step repair and maintenance guides tailored to your exact vehicle. Enter your year, make, and model to get started.
Get Started Free