2004 Audi A6 Problems: 5 Known Issues
2004 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated October 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2004 Audi A6 has 5 documented known issues, with 1 rated critical. The most serious is Headlight-Switch Wiring Fire Recalls JC and JN ($0-$0 repair). Across all issues with published estimates, repair costs range from $120 to $1,800. DIY maintenance guides at au7o.io.
2004 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
No email neededHow interest is saved
Interest applies to the selected vehicle and configuration; it is not a reservation. Voting stores a first-party identifier for up to 180 days to prevent repeat votes. No account or email is needed. Clearing cookies or using another device may count separately. Privacy
Visual coming soon
Your interest helps us choose what to build next.
Visual Known Issues · Coming soon
$4.99/month plus taxes at launch · No payment today
All 5 Known Issues
NHTSA Recalls11 recalls
FUEL SYSTEM, OTHER:STORAGE:TANK ASSEMBLY
VOLKSWAGEN IS RECALLING CERTAIN MODEL YEAR 2001-2004 AUDI A6, MODEL YEAR 2002-2003 S6 AND MODEL YEAR 2003 RS6 VEHICLES EQUIPPED WITH 4.2L ENGINES AND MANUFACTURED FROM JUNE 19, 2001, THROUGH JUNE 8, 2004. THE AGING OF THE PLASTIC MATERIAL IN THE FUEL TANK ROLLOVER VALVE COMBINED WITH BENDING STRESS FROM THE ALUMINUM VENTILATION LINE TO THE ROLLOVER VALVE NIPPLE MAY LEAD TO CRACKING OF THE NIPPLE. IF THIS HAPPENS, A FUEL LEAK MAY RESULT.
FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY
VOLKSWAGEN IS RECALLING 68,240 MY 2001-2004 AUDI A6 QUATTRO VEHICLES EQUIPPED WITH 2.7L, 2.8L, OR 3.0L ENGINES AND MY 2001-2005 ALLROAD QUATTRO VEHICLES EQUIPPED WITH 2.7L OR 4.2L ENGINES. THE AGING OF THE PLASTIC MATERIAL IN THE FUEL TANK ROLLOVER VALVE COMBINED WITH BENDING STRESS FROM THE ALUMINUM VENTILATION LINE TO THE ROLLOVER VALVE NIPPLE MAY LEAD TO CRACKING OF THE NIPPLE. IF THIS HAPPENS, A FUEL LEAK MAY RESULT.
ELECTRICAL SYSTEM
ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH HALOGEN LOW BEAM HEADLIGHTS, CERTAIN CONNECTOR PINS IN THE HEADLIGHT SWITCH CONNECTOR COME INTO CONTACT WITH EACH OTHER CAUSING A SHORT CIRCUIT. NOTE: VEHICLES WITH XENON LOW BEAM HEADLIGHTS ARE NOT AFFECTED BECAUSE THE CIRCUIT IN THESE VEHICLES CONTAINS A FUSE, WHICH PRECLUDES EXCESSIVE CURRENT FLOW IN THE CASE OF A SHORT CIRCUIT. AUDI S6 AND S6 AVANT VEHICLES ARE ALL EQUIPPED WITH XENON LOW BEAM HEADLIGHTS AND, THEREFORE, ARE NOT LONGER AFFECTED BY THIS RECALL.
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
ON CERTAIN VEHICLES PRODUCED FROM SEPTEMBER 2002 - MARCH 2003, EQUIPPED WITH 1.8L TURBO, 2.8L V6, OR 3.0L ENGINES, A CHANGE IN THE ELECTRICAL MOTOR COMPONENTS IN THE FUEL PUMP CAN LEAD TO AN INOPERATIVE FUEL PUMP AND, ULTIMATELY, STOPPAGE OF FUEL SUPPLY TO THE ENGINE CAUSING IT TO STALL.
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
ON CERTAIN VEHICLES EQUIPPED WITH 1.8L TURBO, 2.8L V6, OR 3.0L ENGINES, A CHANGE IN THE ELECTRICAL MOTOR COMPONENTS IN THE FUEL PUMP CAN LEAD TO AN INOPERATIVE FUEL PUMP AND, ULTIMATELY, STOPPAGE OF FUEL SUPPLY TO THE ENGINE CAUSING IT TO STALL.
+ 6 more recalls. Check all on NHTSA.gov
Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.
Join 600+ people using Au7o to better understand their vehicles.
Don't see your problem? Describe your symptoms to get a diagnosis, or get a full repair guide.
Other Audi Models
Frequently Asked Questions
What are the most common Audi A6 problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2004 Audi A6 has 5 documented issues. The most frequently reported are: Headlight-Switch Wiring Fire Recalls JC and JN, C5 Sunroof and Fresh-Air Plenum Drain Water Ingress, Front Suspension Multi-Link Control Arm and Tie-Rod Wear Causing Clunks and Tire Wear. Of these, 1 is rated critical and should be addressed promptly.
Is the Audi A6 reliable?
The 2004 Audi A6 has 5 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: Headlight-Switch Wiring Fire Recalls JC and JN. 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 A6 problems?
Repair costs for known Audi A6 issues range from $0 to $1,800, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Headlight-Switch Wiring Fire Recalls JC and JN, typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 1998-2004 Audi A6 Headlight-Switch Wiring Fire Recalls JC and JN?
Audi recall 04V-133 (campaign JC) covers certain 1998-2004 A6 and S6 vehicles because the knee bolster under the dashboard can be pushed against the headlight-switch wiring harness when the driver's knees press on it, eventually shorting and creating a fire risk in the left dashb… Repairs typically run $0-$0. Severity: high.
What is the 1998-2004 Audi A6 C5 Sunroof and Fresh-Air Plenum Drain Water Ingress?
The federal Dewey settlement record identifies 1998-2005 Audi A6 C5 vehicles with the 4B platform code, including allroad, S, and RS versions, among vehicles alleged to be susceptible to passenger-compartment water ingress through sunroof drains or the fresh-air plenum. This page… Severity: medium.
What is the 2000-2004 Audi A6 Front Suspension Multi-Link Control Arm and Tie-Rod Wear Causing Clunks and Tire Wear?
The C5 A6 uses a multi-link aluminum front suspension with multiple upper and lower control arms whose ball joints and bushings commonly wear out, especially on rough roads or higher-mileage cars. Owners frequently report front-end clunking over bumps, wandering steering, vibrati… Repairs typically run $600-$1,800. Severity: medium.
What is the 2000-2004 Audi A6 2.7T Ignition Coil Pack Failure Causing Misfires and Flashing Check Engine Light?
The 2.7T V6 used in A6 2.7T models is well known for ignition coil pack failures that cause sudden misfires, rough running, and loss of power. This issue was widespread across many early-2000s Audi/VW turbo models and generated numerous owner complaints and service actions. Failu… Repairs typically run $120-$500. Severity: medium.
What is the 1998-2004 Audi A6 C5 A6 Center Driver-Information Display Pixel Loss?
A C5 A6 center driver-information display can develop missing rows, segments, fading, or an unreadable image while the analog gauges and the rest of the cluster continue to operate. That display-only complaint must be separated from a whole cluster that resets, loses power, drops… Severity: low.
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.