What is the 2009-2020 Audi A4 S-Tronic (DSG) Mechatronic Unit Issues?

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.

What is the 2007-2016 Audi A4 2007-2013, 2015-2016 A4 2.0T Coolant Leak at Pump or Thermostat - TSB 2061604/5?

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.

What is the 2022 Audi A4 2022 A4 Infotainment Main-Unit Recall 91Ei - VIN Check Required?

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.

What is the 2009-2011 Audi A4 2009-2011 A4 2.0T CAEB Oil-Consumption Procedure - TSB 2027731/7?

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.

What is the 1997-2001 Audi A4 1.8T oil sludge clogs pickup tube and starves engine of oil?

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.

What is the 1996-1997 Audi A4 1996-1997 A4 Ignition-Switch Recall 06V-403 (JS) - VIN Check Required?

NHTSA 06V403/Audi JS covers certain 1996-1997 A4 vehicles and superseded recall 00V317.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.

What is the 2009-2013 Audi A4 2009-2013 A4 Timing Chain/Tensioner Diagnosis - Warranty Key U35?

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.

What is the 1997-2000 Audi A4 1997-2000 A4 Driver-Airbag Inflator Recall 69BT - NHTSA 20V056 / 22V471?

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.

What is the 2005-2007 Audi A4 2005-2007 A4 2.0TFSI Cam-Follower / HPFP Diagnosis - TSB 2013147/12?

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.

What is the 2009-2015 Audi A4 PCV Valve/Breather System Failure?

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.

What is the 2009-2018 Audi A4 Coolant Flange/Fitting Leaks?

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.

What is the 2022-2025 Audi A4 12V Battery Drain and No-Start from Faulty Gateway/Telematics Sleep Behavior?

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.

What is the 1996-2001 Audi A4 Front upper/lower control arm bushing and ball-joint failure causes clunking?

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.

What is the 1996-2001 Audi A4 G62 Engine Coolant Temperature Sensor (black-housing) fails causing erratic temp gauge, hard cold starts and rich-running?

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.

What is the 2002-2008 Audi A4 B6/B7 Front Suspension Control Arm and Tie-Rod Wear Causing Clunks, Vibration, and Uneven Tire Wear?

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.

What is the 2000-2005 Audi A4 Instrument Cluster LCD Pixel Failure and Intermittent Gauge/Warning Display Problems?

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.

What is the 2022-2025 Audi A4 Sunroof Drain/Seal Water Intrusion Causing Wet Carpets and Interior Electronics Concerns?

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.

What is the 2010-2011 Audi A4 2010-2011 A4/A4 Avant CAEB Bosch Ignition-Coil Diagnosis - TSB 2033561/2?

Audi TSB 2033561/2 applies only to CAEB-engine A4/A4 Avant vehicles in these VIN-suffix ranges: 2010 AA121937-AA999999 or AN045790-AN999999; 2011 BA000001-BA128744 or BN000001-BN045180. The supported condition is an engine that shakes with P0300, P0301-P0304 and/or P130A because… Severity: medium.

Audi · Known Issues

1996-2025 Audi A4 Problems: 25 Known Issues

1996-2025 model years · 3,100+ owner reports · Updated August 2026

Share:@au7o.io

According to Au7o's analysis of 3,100+ owner reports, the 1996-2025 Audi A4 has 25 documented known issues, with 11 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, 2009-2011 A4 2.0T CAEB Oil-Consumption Procedure - TSB 2027731/7, 1.8T oil sludge clogs pickup tube and starves engine of oil ($300-$3,500 repair), 1996-1997 A4 Ignition-Switch Recall 06V-403 (JS) - VIN Check Required, 2009-2013 A4 Timing Chain/Tensioner Diagnosis - Warranty Key U35, 1997-2000 A4 Driver-Airbag Inflator Recall 69BT - NHTSA 20V056 / 22V471, 2005-2007 A4 2.0TFSI Cam-Follower / HPFP Diagnosis - TSB 2013147/12 and . at .

Frequently Asked Questions

What are the most common Audi A4 problems?

According to Au7o's analysis of 3,100+ owner reports, the 1996-2025 Audi A4 has 25 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, 11 are rated critical and should be addressed promptly.

Is the Audi A4 reliable?

The 1996-2025 Audi A4 has 25 known issues documented across 3,100+ owner reports. 11 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 2009-2011 A4 2.0T CAEB Oil-Consumption Procedure - TSB 2027731/7 and 1.8T oil sludge clogs pickup tube and starves engine of oil and 1996-1997 A4 Ignition-Switch Recall 06V-403 (JS) - VIN Check Required and 2009-2013 A4 Timing Chain/Tensioner Diagnosis - Warranty Key U35 and 1997-2000 A4 Driver-Airbag Inflator Recall 69BT - NHTSA 20V056 / 22V471 and 2005-2007 A4 2.0TFSI Cam-Follower / HPFP Diagnosis - TSB 2013147/12 and 2002-2006 A4 Factory-CVT Settlement History - Component-Specific Diagnosis. 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 A4 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.

What year Audi A4 is the most reliable?

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 25 documented issues documented across 3,100+ owner reports.

All 25 Known Issues

Other Audi Models

Frequently Asked Questions

What are the most common Audi A4 problems?

Is the Audi A4 reliable?

How much does it cost to fix common Audi A4 problems?

What year Audi A4 is the most reliable?

When Issues Typically Appear

2007-2013, 2015-2016 A4 2.0T Coolant Leak at Pump or Thermostat - TSB 2061604/5#

2009-2011 A4 2.0T CAEB Oil-Consumption Procedure - TSB 2027731/7#

1.8T oil sludge clogs pickup tube and starves engine of oil#

2009-2013 A4 Timing Chain/Tensioner Diagnosis - Warranty Key U35#

PCV Valve/Breather System Failure#

G62 Engine Coolant Temperature Sensor (black-housing) fails causing erratic temp gauge, hard cold starts and rich-running#

2010-2011 A4/A4 Avant CAEB Bosch Ignition-Coil Diagnosis - TSB 2033561/2#

2021-2022 A4 Rearview-Camera Software Recalls 91DZ / 91CR - VIN Check Required#

2022 A4 Infotainment Main-Unit Recall 91Ei - VIN Check Required#

1996-1997 A4 Ignition-Switch Recall 06V-403 (JS) - VIN Check Required#

1997-2000 A4 Driver-Airbag Inflator Recall 69BT - NHTSA 20V056 / 22V471#

S-Tronic (DSG) Mechatronic Unit Issues#

2002-2006 A4 Factory-CVT Settlement History - Component-Specific Diagnosis#

2005-2007 A4 2.0TFSI Cam-Follower / HPFP Diagnosis - TSB 2013147/12#

2009-2021 A4 2.0T Gasoline-Quality Deposit Diagnosis - TSB 2014753/13#

12V Battery Drain and No-Start from Faulty Gateway/Telematics Sleep Behavior#

Instrument Cluster LCD Pixel Failure and Intermittent Gauge/Warning Display Problems#

Central locking vacuum pump fails: shattered graphite impeller or water-intrusion fried electronics#

Instrument cluster (MID) and climate control LCD pixel/segment failure#

Front upper/lower control arm bushing and ball-joint failure causes clunking#

B6/B7 Front Suspension Control Arm and Tie-Rod Wear Causing Clunks, Vibration, and Uneven Tire Wear#

1997-2001 A4 ABS 5.3 Scan-Communication Fault - TSB 2042048/1#

2022-2025 A4 Brake Squeal or Pulsation Diagnosis - TSBs 2051095/8 and 2022584/12#

Coolant Flange/Fitting Leaks#

Sunroof Drain/Seal Water Intrusion Causing Wet Carpets and Interior Electronics Concerns#