The most-documented Audi A6 problems are the passenger airbag inflator recall 18V427 on 2009–2011 cars, coolant pump leaks on 2009–2011 3.0 TFSI cars (Service Action 19H1/F1), fuel leak recalls 17V781 and 19V035 on the C7, the 2.0T coolant pump recall 18V229, and V6 TFSI coolant pump and oil leak bulletins on 2019-and-later cars.
CarWhere lists 12 documented A6 issues, including 8 NHTSA safety recalls, each with affected years, powertrains, symptoms, pre-purchase checks and a source.
A6 generations at a glance
Audi A6 generations and the known issues listed for each
Passenger airbag inflator can explode (recall 18V427) (2005–2011)
Safety recall
Generation:
C6 (2009–2011)
Years:
2005–2011
Powertrain:
All
Volkswagen recalled 2005–2011 A6 sedans, 2006–2011 A6 Avants and 2007–2011 S6 sedans because the passenger frontal airbag inflator propellant can degrade with long exposure to humidity and temperature cycling and explode in a crash. Dealers replace the passenger airbag with an alternate part; it supersedes earlier regional recalls such as 16V382.
Symptoms
No symptoms before a crash
Check before buying
Run the 17-digit VIN through NHTSA’s recall lookup and confirm the remedy shows as complete
Ask an Audi dealer for the repair order showing the recall work
Audi’s Service Action 19H1/F1 letter says a seal inside the coolant pump can wear early and leak on a limited number of 2009–2011 Audi vehicles with the 3.0 TFSI, 3.0 TDI and 3.2 FSI engines (the letter is VIN-specific; on the A6 this means 3.0 TFSI and 3.2 FSI cars). Dealers replaced the pump free of charge, and Audi extended the powertrain warranty to 5 years or 100,000 miles for the then-current owner (non-transferable).
Symptoms
Coolant System Malfunction light
Coolant loss
Check before buying
Ask an Audi dealer whether Service Action 19H1/F1 was completed on the VIN
Check the coolant level and look for leaks at the front of the engine
Two class settlements in New Jersey federal court alleged the EA888 2.0 TFSI timing chain system can fail early. Timing Chain I covered 2012 A6 with the 2.0 TFSI along with other EA888 Audis; Timing Chain II covered 2012–2015 A4, A5 and Q5. Both reimburse qualifying repairs and extend coverage for timing chain or tensioner failure to 10 years or 100,000 miles from the in-service date, subject to claim rules. A failed tensioner can let the chain jump and damage the engine.
Symptoms
Rattle from the engine for a few seconds after a cold start
Check-engine light with cam/crank correlation codes
Engine will not start or stalls if the chain has skipped
Check before buying
Listen to a true cold start for chain rattle
Ask whether the timing chain tensioner has been replaced with the updated part, and for the receipt
Scan for stored camshaft/crankshaft correlation codes
Audi recalled 2012–2015 A6 with the 2.0 TFSI (along with A4, A5 and Q5) with the 2.0 TFSI because the electric coolant (after-run) pump can be blocked by debris or short-circuit from moisture, overheat and raise the risk of a fire. Recall 17V002 first added software that cuts power to a blocked pump; recall 18V229 then replaced the pumps free of charge.
Symptoms
Coolant-temperature or coolant-system warning
Fan or pump running after shutdown
Burning smell from the engine bay
Check before buying
Run the 17-digit VIN through NHTSA’s recall lookup and confirm the remedy shows as complete
Ask an Audi dealer for the repair order showing the recall work
Confirm both 17V002 (software) and 18V229 (pump replacement) are closed
Fuel line can weaken and leak (recall 17V781) (2012–2014)
Safety recall
Generation:
C7 (2012–2018)
Years:
2012–2014
Powertrain:
See recall for engine applicability
The fuel line on 2012–2014 A6 and A7 models has a compression point that can weaken and leak fuel, raising the risk of fire. Dealers replace the fuel line free of charge.
Symptoms
Fuel smell from the engine bay
Check before buying
Run the 17-digit VIN through NHTSA’s recall lookup and confirm the remedy shows as complete
Ask an Audi dealer for the repair order showing the recall work
Passenger airbag sensor mat can wear (recall 18V370) (2012–2018)
Safety recall
Generation:
C7 (2012–2018)
Years:
2012–2018
Powertrain:
All (basic seats)
Stress or wear of the body-sensing mat in the front passenger seat of 2012–2018 A6 sedans and 2013–2018 S6 with basic seats can make the occupant detection module malfunction, so the passenger airbag may not deploy properly. Dealers install a repair kit.
Symptoms
Airbag warning light
Passenger airbag-off light lit unexpectedly
Check before buying
Run the 17-digit VIN through NHTSA’s recall lookup and confirm the remedy shows as complete
Ask an Audi dealer for the repair order showing the recall work
The turbocharger oil supply strainer on 2013–2017 S6 sedans (and S7, RS 7, A8 and S8) can become blocked and starve the turbo bearings of oil. Worn bearings can let the turbine wheel hit its housing or break the shaft and stall the engine. Dealers replace the strainer and change the oil.
Symptoms
Whining or grinding from the turbos
Loss of boost or check-engine light
Engine stall
Check before buying
Run the 17-digit VIN through NHTSA’s recall lookup and confirm the remedy shows as complete
Ask an Audi dealer for the repair order showing the recall work
Left and right fuel rails may leak (recall 19V035) (2016–2018)
Safety recall
Generation:
C7 (2012–2018)
Years:
2016–2018
Powertrain:
See recall for engine applicability
Audi recalled 2016–2018 A6 and A7 (with Q7 and A8) because the left and right fuel rails may leak fuel, raising fire risk. Dealers replace both fuel rails.
Symptoms
Fuel smell from the engine bay
Check before buying
Run the 17-digit VIN through NHTSA’s recall lookup and confirm the remedy shows as complete
Ask an Audi dealer for the repair order showing the recall work
Rear-seat spill can shut down the gateway module (recall 22V861) (2019–2022)
Safety recall
Generation:
C8 (2019–present)
Years:
2019–2022
Powertrain:
All
Liquid spilled in the rear seat of 2019–2022 A6 sedans, 2020–2022 A6 allroad and S6, and 2021–2022 RS 6 Avant can reach the gateway control module and shut it down, suddenly reducing engine power. Dealers install a protective cover.
Symptoms
Sudden loss of power with multiple warnings after a spill
Check before buying
Run the 17-digit VIN through NHTSA’s recall lookup and confirm the remedy shows as complete
Ask an Audi dealer for the repair order showing the recall work
Fuel gauge can read wrong from a sticking sender (recall 22V155) (2019–2022)
Safety recall
Generation:
C8 (2019–present)
Years:
2019–2022
Powertrain:
All
The fuel level sender on 2019–2022 A6 sedans, 2020–2022 A6 allroad and S6, and 2021–2022 RS 6 Avant can stick and show an inaccurate fuel level, so the car can run out of fuel and stall. Dealers install a new in-tank sensor.
Symptoms
Fuel gauge stuck or reading more fuel than is in the tank
Check before buying
Run the 17-digit VIN through NHTSA’s recall lookup and confirm the remedy shows as complete
Ask an Audi dealer for the repair order showing the recall work
Audi bulletin TSB 2070349 covers coolant loss traced to the coolant pump on V6 TFSI engines, listing 2019–2024 A6 and 2020–2024 S6 and A6 allroad. The revision notes that in some cases a P0299 underboost code is logged because coolant from the leaking pump contaminates a switch valve. Outside warranty the bulletin is informational only.
Symptoms
Coolant warning lamp
Coolant level dropping with no obvious puddle
Check-engine light, sometimes with an underboost code
Check before buying
Check the coolant reservoir level cold
Ask for records of any coolant-pump replacement
Have a pre-purchase inspection pressure-test the cooling system
Audi bulletin TSB 2053278 covers oil leaking around the cylinder head cover, injectors and valvelift actuator on 2.9 and 3.0 TFSI engines, listing 2019–2020 A6 and S6 and early-2021 cars by VIN. Audi attributes it to metal shavings left in the sealing groove during manufacture and says production processes were improved.
Symptoms
Oil loss or low-oil warning
Burning-oil smell from the engine bay
Oil residue around the valve cover or underbody
Check before buying
Look for wet oil around the top of the engine and under the car
Ask whether the cylinder head cover was resealed under TSB 2053278
Owners filed 617 complaints about the Audi A6 with NHTSA for the model years below, the most for the 2019 model year (114). The components cited most often are electrical system, engine and air bags. Counts are raw filings, not rates: newer and higher-volume years naturally collect more, and a complaint is an owner's report, not a confirmed defect.
NHTSA owner complaints for the Audi A6 by model year (all US body styles and S/RS variants, de-duplicated by NHTSA complaint number), as of November 2026
Model year
Complaints
Crash or fire reported
Injury reported
Safety-critical component
2026
9
1
1
6
2025
7
0
0
1
2024
5
0
0
3
2023
3
0
0
0
2022
8
0
0
3
2021
31
0
0
10
2020
37
0
1
7
2019
114
3
2
48
2018
6
1
0
4
2017
25
0
0
13
2016
70
3
1
53
2015
27
3
1
20
2014
61
1
2
44
2013
94
5
2
69
2012
60
0
0
38
2011
21
1
1
5
2010
18
3
0
5
2009
21
0
0
1
Most-cited components across these years: Electrical system (191) · Engine (173) · Air bags (105) · Power train (58) · Steering (55) · Unknown or other (54). A complaint can name more than one component.
Source: NHTSA Office of Defects Investigation complaints database, queried by CarWhere for every NHTSA model name filed for this nameplate (A6, A6 (WITH REAR SEAT SABS), A6 ALLROAD, A6 AVANT, A6 SEDAN, AUDI A6, AUDI A6 ALLROAD, AUDI S6, RS 6 AVANT, S6). “Safety-critical component” counts complaints that report a crash, fire, injury or death, or name the engine, power train, steering, service brakes or fuel system.
Related A6 research
This page explains specific mechanical issues and recalls. Which model years drew the most owner complaints relative to the rest of the model’s history is answered in the years-to-avoid research where CarWhere publishes it.
Engine, transmission and packages decide which of these issues apply. The CarWhere Audi build sheet reconstructs factory colors, options and packages from licensed VIN-level build data — availability is checked free, and it is $9.99 only when detailed build data is found for that VIN.
The most-documented are passenger airbag inflator recall 18V427 on 2009–2011 cars, coolant pump leaks on 2009–2011 3.0 TFSI cars, fuel leak recalls 17V781 and 19V035 on the C7, and V6 TFSI coolant pump and oil leak bulletins on 2019-and-later cars.
Does the Audi A6 3.0T have coolant pump problems?
Yes, on two generations. Audi’s Service Action 19H1/F1 replaced leaking coolant pumps on some 2009–2011 3.0 TFSI cars and extended powertrain coverage, and bulletin TSB 2070349 covers coolant pump leaks on 2019–2024 A6 V6 TFSI engines.
Is there a fuel leak recall on the Audi A6?
Several. 17V781 replaced a fuel line on 2012–2014 A6 and A7, 19V035 replaced the fuel rails on 2016–2018 models, and 13V450 covered a fuel line on 2013–2014 S6 and S7 with the 4.0L engine.
Does the Audi S6 4.0T have turbo problems?
Recall 22V178 covers 2013–2017 S6 (plus S7, RS 7, A8 and S8). The turbocharger oil supply strainer can clog and wear the turbo bearings, which can stall the engine. Dealers replace the strainer and change the oil.
How do I check a used Audi A6 for open recalls?
Enter the 17-digit VIN in NHTSA’s recall lookup or ask an Audi dealer to run it. Recall repairs are free regardless of mileage or owner.
Sources
Issue descriptions are CarWhere’s own summaries of the sources below. Repair costs are shown only where a source states them and vary by shop and region.
Independent reference compiled by CarWhere — not affiliated with or endorsed by AUDI AG or Audi of America. Audi, quattro, TFSI, S tronic, e-tron and the model names are trademarks of their owners.