Audi · Known Issues
1996-2025 Audi A4 Problems: 27 Known Issues
1996-2025 model years · 3,100+ owner reports · Updated September 2026
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1996-2025 model years · 3,100+ owner reports · Updated September 2026
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According to Au7o's analysis of 3,100+ owner reports, the 1996-2025 Audi A4 has 27 documented known issues, with 12 rated critical. The most serious are S-Tronic (DSG) Mechatronic Unit Issues ($600-$4,000 repair), 2021-2022 A4 Rearview-Camera Software Recalls 91DZ / 91CR - VIN Check Required, 2007-2013, 2015-2016 A4 2.0T Coolant Leak at Pump or Thermostat - TSB 2061604/5, 2022 A4 Infotainment Main-Unit Recall 91Ei - VIN Check Required, Broken Crank Sensor Harness Behind the Bellhousing Mimics a Dead Sensor ($100-$400 repair), 1.8T oil sludge clogs pickup tube and starves engine of oil ($300-$3,500 repair), 2005-2007 A4 2.0TFSI Cam-Follower / HPFP Diagnosis - TSB 2013147/12, 1996-1997 A4 Ignition-Switch Recall 06V-403 (JS) - VIN Check Required, 2002-2006 A4 Factory-CVT Settlement History - Component-Specific Diagnosis, 1997-2000 A4 Driver-Airbag Inflator Recall 69BT - NHTSA 20V056 / 22V471, 2009-2011 A4 2.0T CAEB Oil-Consumption Procedure - TSB 2027731/7 and 2009-2013 A4 Timing Chain/Tensioner Diagnosis - Warranty Key U35. The most commonly reported issue is PCV Valve/Breather System Failure with 1,200 owner reports. Across all issues with published estimates, repair costs range from $15 to $4,000. DIY maintenance guides at au7o.io.
SEAT BELTS:REAR/OTHER:RETRACTOR
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Volkswagen ID4, Audi A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A5 Sportback, A6 Allroad, A6 Sedan, A7, A8, E-Tron Quattro, E-Tron Sportback Quattro, Q3, Q5, Q5 Sportback, Q7, Q8, RS5 Sportback, RS5 Coupe, RS6 Avant, RS7, RSQ8, S4 Sedan, S5 Cabriolet, S5 Coupe, S5 Sportback, S6 Sedan, S7, S8, SQ5, SQ5 Sportback, SQ7, SQ8, and 2021-2022 S3 Sedan vehicles. The rear seat belt automatic locking retractors may deactivate early, which can prevent the child restraint system from securing properly. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
TIRES
Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2021 Audi A5 Sportback, RS5 Coupe, RS5 Sportback, S5 Sportback, 2020-2021 A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A6 Allroad, A6 Sedan, A7, A8, Q5, S4 Sedan, S5 Coupe, S5 Cabriolet, S6 Sedan, S7, S8, SQ5, 2021 Q5 Sportback, Q7, Q8, RS6 Avant, RS7, RSQ8, SQ5 Sportback, SQ7, and SQ8 vehicles. The rear axle alignment may not have been inspected after the repairs for Recall 21V-295 (42L1) were performed.
SUSPENSION:REAR:AXLE:NON-POWERED AXLE ASSEMBLY
Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Q7, Q8, Q5 Sportback, SQ5 Sportback, RS6 Avant, RS7, RS Q8, 2020-2021 Audi S6 sedan, Q5, A8, S8, A7, A6 Allroad, A5 Cabriolet, A4 sedan, A4 Allroad, SQ5, S7, A6 sedan, S5 coupe, S4 sedan, S5 Cabriolet, A5 coupe, 2019-2021 RS5 coupe, A5 Sportback, S5 Sportback, RS5 Sportback vehicles. The lock nut on the trailing arm of the rear axle may break due to stress corrosion.
BACK OVER PREVENTION:DISPLAY FUNCTION
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Audi A8, RS7, RS6 Avant, RS5 Sportback, RS5 Coupe, Q8, Q7, Q5 Sportback, S4 Sedan, Q5, A7, A6, A6 Allroad, A5 Sportback, A5 Coupe, A5 Cabrioleet, A4 Sedan, A4 Allroad, E-Tron Sportback Quattro, SQ7, S5 Cabriolet, E-Tron Quattro, SQ8, SQ5 Sportback, SQ5, S8, S7, S6 Sedan, S5 Sportback, S5 Coupe, 2022 E-Tron GT, and 2021-2022 RSQ8 vehicles. Due to a software issue, a blank or black screen may be displayed instead of the rearview camera image when the vehicle is placed in reverse gear. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."
BACK OVER PREVENTION: SENSING SYSTEM: CAMERA
Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Audi A8 and S8, 2022 Audi A5 Sportback, A4 Sedan, E-Tron GT, Q3, Q5, RS6 Avant, A3 Sedan, S5 Sportback, Q5 Sportback, Q7, Q8, RSQ8, SQ7, SQ8, and S3 Sedan vehicles. A software error may prevent the rear-view image from initially displaying when the vehicle begins to reverse. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."
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According to Au7o's analysis of 3,100+ owner reports, the 1996-2025 Audi A4 has 27 documented issues. The most frequently reported are: S-Tronic (DSG) Mechatronic Unit Issues, 2021-2022 A4 Rearview-Camera Software Recalls 91DZ / 91CR - VIN Check Required, 2007-2013, 2015-2016 A4 2.0T Coolant Leak at Pump or Thermostat - TSB 2061604/5. Of these, 12 are rated critical and should be addressed promptly.
The 1996-2025 Audi A4 has 27 known issues documented across 3,100+ owner reports. 12 issues are rated critical: S-Tronic (DSG) Mechatronic Unit Issues and 2021-2022 A4 Rearview-Camera Software Recalls 91DZ / 91CR - VIN Check Required and 2007-2013, 2015-2016 A4 2.0T Coolant Leak at Pump or Thermostat - TSB 2061604/5 and 2022 A4 Infotainment Main-Unit Recall 91Ei - VIN Check Required and Broken Crank Sensor Harness Behind the Bellhousing Mimics a Dead Sensor and 1.8T oil sludge clogs pickup tube and starves engine of oil and 2005-2007 A4 2.0TFSI Cam-Follower / HPFP Diagnosis - TSB 2013147/12 and 1996-1997 A4 Ignition-Switch Recall 06V-403 (JS) - VIN Check Required and 2002-2006 A4 Factory-CVT Settlement History - Component-Specific Diagnosis and 1997-2000 A4 Driver-Airbag Inflator Recall 69BT - NHTSA 20V056 / 22V471 and 2009-2011 A4 2.0T CAEB Oil-Consumption Procedure - TSB 2027731/7 and 2009-2013 A4 Timing Chain/Tensioner Diagnosis - Warranty Key U35. 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.
Repair costs for known Audi A4 issues range from $15 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, S-Tronic (DSG) Mechatronic Unit Issues, typically costs $600-$4,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
Reliability varies across model years of the Audi A4. Based on documented issues, problems 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 1996-2025 Audi A4 with 27 documented issues documented across 3,100+ owner reports.
The S-Tronic dual-clutch transmission can experience mechatronic unit problems, similar to VW's DSG issues. This can cause shifting problems, jerky operation, and warning lights. Repairs typically run $600-$4,000. Severity: high.
NHTSA 22V742/Audi 91DZ covers certain 2021 A4 Sedan and A4 allroad vehicles, while NHTSA 21V825/Audi 91CR covers certain 2022 A4 Sedan vehicles. The rearview-camera image may be blank, black or initially unavailable when reverse is selected. The applicable population and software… Severity: high.
Audi TSB 2061604/5 applies to A4 2.0TFSI vehicles for model years 2007-2013 and 2015-2016 when the coolant-temperature warning is on or clear coolant marks are visible under the front of the vehicle or engine compartment, the leak can be reproduced, and pressure testing localizes… Severity: high.
NHTSA 22V806/Audi 91Ei covers certain 2022 A4 Sedan and A4 allroad vehicles. Internal damage can occur in the infotainment main unit after vehicle shutdown; on restart, the center display and rearview-camera image may be unavailable. The recall does not establish a generic 2023-2… Severity: high.
B6/B7 A4 owners who set P0322 almost always buy an engine speed sensor (G28) first, and a share of them are back on the forums a week later with the same code and the same no-start. The reason is that on this platform the failure is often the circuit rather than the pickup. The G… Repairs typically run $100-$400. Severity: high.
Engine oil sludge is a well-documented issue on the longitudinally-mounted 1.8T in the B5 A4. Volkswagen of America warned 426,000 VW Passat and Audi A4 owners of an engine oil sludge problem affecting 1.8-liter turbocharged four-cylinder engines on 1998 to 2004 Passats and 199… Repairs typically run $300-$3,500. Severity: high.
Audi TSB 2013147/12 applies to 2005-2006 A4 vehicles with the BPG engine and 2007 A4 vehicles with the BWT engine when the MIL is on and P2293 is stored; P0087 or P1093 may accompany it. Audi’s procedure checks fuel pressure and wear at the cam follower, intake camshaft lobe and… Severity: high.
NHTSA 06V403/Audi JS covers certain 1996-1997 A4 vehicles and superseded recall 00V317. The ignition-switch spring anchor can fracture so the key does not fully return to the run position after starting; windshield wipers and headlights may then be inoperative. VIN verification i… Severity: high.
The 2013 settlement covered U.S. 2002-2006 A4 vehicles originally equipped with a factory-installed CVT. It used component-specific branches: TCM for 2003-2006; valve body for 2003-2004; and transmission without valve body/TCM for 2002-2004, subject to maintenance proof. Plaintif… Severity: high.
Audi’s 69BT campaign circular covers certain 1997-2000 A4 vehicles. The NHTSA filing history has two A4 model-year branches: 20V056 lists 1999-2000, and the later 22V471 correction adds the 1997-1998 branch that had been entered incorrectly in the portal. Moisture-related NADI in… Severity: high.
Audi TSB 2027731/7 covers a customer complaint on 2009-2011 A4 vehicles with the CAEB 2.0 TFSI. It checks the installed crankcase-pressure regulating valve, specifies a front crankshaft seal and bolt, applies matching ECM software and performs an electronic oil-consumption measur… Severity: high.
Audi Warranty Bulletin AWA-18-15 applies only to certain 2009-2012 A4 Avant and 2009-2013 A4 Sedan vehicles with the 2.0L EA888 engine whose VIN data contains Warranty Key U35. It historically covered a failed timing chain and/or tensioner for 10 years or 100,000 miles, with cond… Severity: high.
The PCV system can fail, causing rough idle, boost leaks, and increased oil consumption. The diaphragm in the valve cover can tear. This is a common issue on earlier 2.0T engines. Repairs typically run $300-$800. Severity: medium.
Various plastic coolant flanges and fittings can crack and leak, particularly on the side of the engine. These plastic components become brittle with age and heat exposure. Multiple leak points possible. Repairs typically run $150-$500. Severity: medium.
Multiple late-model Audi/VW MQB-derivative vehicles, including B9.5 A4s, have owner reports of repeated low-voltage warnings, dead batteries after sitting, and intermittent no-start conditions. The pattern is commonly linked to control modules not entering sleep mode properly, te… Repairs typically run $300-$1,200. Severity: medium.
One of the most common suspension issues seen on Audi A4s is worn or failed control arm bushings; the bushings receive the most pressure during braking or heavy acceleration, and these forces cause the rubber to fatigue and crack . When inspecting at the inboard end where the c… Repairs typically run $250-$1,400. Severity: medium.
The original black-housing dual coolant temperature sensor (G62) mounted in the coolant flange at the back of the cylinder head develops cracks and fails internally. The temperature sensor G2 (also known as G62) for the gauge has likely failed and is relatively easy to fix; it i… Repairs typically run $30-$180. Severity: medium.
The multi-link front suspension used on B6/B7 A4 models is well known for premature wear of upper and lower control arm bushings/ball joints and, in many cases, outer tie-rod ends. Owners commonly report front-end clunking over bumps, looseness in steering, shimmy at highway spee… Repairs typically run $700-$1,800. Severity: medium.
B5 and early B6 A4 models commonly suffer from failing instrument cluster displays, especially the center LCD where outside temperature, warning messages, and trip computer information become unreadable due to missing pixels. Some owners also report intermittent gauge behavior or… Repairs typically run $250-$900. Severity: medium.
Panoramic/sunroof-equipped A4s continue to generate owner complaints about water entering the cabin, usually from clogged drains, disconnected drain tubes, or seal alignment issues. Owners often first notice damp headliners, wet front or rear carpets, musty odors, or intermittent… Repairs typically run $150-$2,000. Severity: medium.
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.