Audi · Known Issues
2009 Audi A4 Problems: 7 Known Issues
2009 model year · 3,100+ owner reports · Updated September 2026
2009 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
2009 model year · 3,100+ owner reports · Updated September 2026
2009 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 3,100+ owner reports, the 2009 Audi A4 has 7 documented known issues, with 4 rated critical. The most serious are S-Tronic (DSG) Mechatronic Unit Issues ($600-$4,000 repair), 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 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 $150 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.
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According to Au7o's analysis of 3,100+ owner reports, the 2009 Audi A4 has 7 documented issues. The most frequently reported are: S-Tronic (DSG) Mechatronic Unit Issues, 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. Of these, 4 are rated critical and should be addressed promptly.
The 2009 Audi A4 has 7 known issues documented across 3,100+ owner reports. 4 issues are rated critical: S-Tronic (DSG) Mechatronic Unit Issues and 2007-2013, 2015-2016 A4 2.0T Coolant Leak at Pump or Thermostat - TSB 2061604/5 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 $150 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.
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.
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.
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.
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."
SEATS
Volkswagen Group of America, Inc. (Audi) is recalling certain 2017-2020 A4 Allroad, A4 Sedan, 2018-2019 RS5 Coupe, 2019 RS5 Sportback, 2018-2020 A5 Cabriolet, A5 Coupe, A5 Sportback, S4 Sedan, S5 Cabriolet, S5 Coupe, and Audi S5 Sportback vehicles. The cable connecting the seat heater to the Passenger Occupant Detection System (PODS) may have a contact fault, causing the software to misdiagnose a malfunction and disable the passenger air bag.
Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.
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.
Audi states that contaminated gasoline or gasoline with insufficient deposit-control additives can contribute to deposits on intake valves, the intake manifold, fuel injectors and combustion chambers. Possible results include rough running after cold start, extended cranking, hes… Severity: medium.