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2004 Audi A6: common problems and reliability
· 2000-2005One of the weaker A6 years.
70 owner complaints, most about fuel system. 4 recalls.
Should I buy a 2004 A6?The 2004 Audi A6 has 70 owner-filed NHTSA complaints and 4 recalls on record. The most-reported areas are fuel system and gasoline. Owners most often flag 2.7t turbo failure: turbos often fail past 100,000 miles, with replacement costs of $5,000–$10,000.
Safety record for the 2004 model year
Source: NHTSA complaints and recalls filed for 2004 Audi A6 vehicles (US, public record).
The Year Score compares this year with other A6 years only. How we score it
Is 2004 a good year for the A6?
Across the 30 A6 model years we track, complaint volume runs from 2 (2023) to 231 (1999). With 70 complaints, the 2004 A6 sits above the model's median of 54.
These are raw NHTSA complaint totals, not adjusted for how many cars sold or how long each model year has been on the road. Older and higher-selling years accumulate more complaints.
Where owners report problems
Recalls affecting the 2004 A6
fuel system, other:storage:tank assembly
Campaign 11V267000VOLKSWAGEN 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
Campaign 08V157000VOLKSWAGEN 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
Campaign 06V198000ON 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.
electrical system
Campaign 04V133000ON CERTAIN PASSENGER VEHICLES, IF A DRIVER'S KNEES PUSH AGAINST THE KNEE BOLSTER (CRASH ELEMENT) LOCATED UNDER THE DASHBOARD, IT CAN CONTACT THE HEADLIGHT SWITCH WIRING HARNESS, AND AN ELECTRICAL SHORT COULD OCCUR.
What owners report on the 2000-2005 A6
Owners are sharply divided on this generation. The 2.7T twin-turbo engine is widely described as a powerful but unreliable and expensive-to-maintain "lemon of a motor," with many recounting repair bills in the thousands.
- Very frequent2.7T turbo failure
Turbos often fail past 100,000 miles, with replacement costs of $5,000–$10,000.
- Very frequentTiming belt due by age (every ~90,000 miles or 10 years)
Failure can destroy the engine.
- RecurrentABS module failure (flashing brake light and ABS light)
Often requires rebuild or replacement.
- RecurrentAutomatic transmission (ZF 5HP) failure
Clutch packs fry past 400 hp; the 2.7T's torque is hard on the box.
- RecurrentSuspension clunks from multiple ball joints (four per side up front)
Owner insights for the 2000-2005 A6. Read the full 2000-2005 owner report.
Other A6 model years
Compare every A6 year side by side to see how 2004 ranks against the rest.
Compare the A6 against its rivals
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