2004 Audi A6 Engine cooling Problems
- Complaints
- 3about this part
- Share
- 9%of 35 total for the year
- Median mileage
- 92,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 3 complaints about the engine cooling of the 2004 Audi A6, 9% of the 35 complaints for this model year. Where a mileage was given, the median is 92,000 miles. 1 of these say a crash was involved, according to the filers.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I am writing about my 2004 A6 avant, which has 78,000 miles. At a recent oil service at an independent garage, it was suggested that there was a problem with the catalytic converters. Exhaust was leaking from both sides, I was told. I took the car to my Audi dealer, where they checked the exhaust system. The mechanic who examined the car concurred that the catalytic converters needed to be replaced. Under a federally mandated warranty, the catalytic converters are covered for eight years or 80,000 miles. …”
NHTSA complaint #10356542, filed 2010-09, 78,100 miles“The contact owns a 2004 Audi A6 avant. The contact stated that the check engine light had been illuminating intermittently. The dealer stated that the contact should not worry about the light. While driving 65 MPH, the contact swerved to miss a deer and lost control of the vehicle. It began to rock back and forth and the brakes were inoperative. The contact hit guardrails on both the driver and passenger sides. The vehicle then tipped on its side and went into a ravine. The engine was still running and the wheels were still spinning. The air bags did not deploy. …”
NHTSA complaint #10377974, filed 2011-01, 190,000 milesRelated service bulletins
- 10123764Sep 8, 2015Supersedes Technical Service Bulletin Group 19 number 15-61 dated July 7, 2015. Discontinuation and mixing of Audi-approved engine coolants. G11, G12, and G12+ coolants have been…
- 10128399Jul 7, 2015Supersedes Technical Service Bulletin Group 19 number 14-50 dated June 20, 2014. Discontinuation and mixing of Audi-approved engine coolants. G11, G12, and G12+ coolants have…
- 10119945Mar 17, 2015Supersedes Technical Service Bulletin Group 10 number 13-10 dated September 5, 2013. Prior to engine replacement, any debris lodged in transferred assemblies must be removed. If…
- 10119946Mar 6, 2015Supersedes Technical Service Bulletin Group 17 number 13-35 dated January 9, 2013. This bulletin lists engine oils that meet Audi oil quality standards (VW 501 01, 502 00, 505…
- 10120682Feb 13, 2015Supersedes Technical Service Bulletin Group 01 number 13-69 dated February 14, 2013. Noises and inconsistent engine operation after cold start during the catalyst heating phase…
- 10231130Jun 30, 2014Idenifying and mixing factory fill engine coolants
- 10122415Jun 20, 2014Supersedes Technical Service Bulletin Group 19 number 13-41 dated June 20, 2013. Discontinuation and mixing of Audi-approved engine coolants. G11, G12, and G12+ coolants have…
- 10210680Jun 3, 2014As the sump pan gasket settles, the torque of the bolts decreases and the seal may leak. Automatic transmission fluid is leaking at the sump pan gasket.
- 10121324Sep 5, 2013Supersedes Technical Service Bulletin Group 10 number 10-02 dated September 14, 2010. Prior to engine replacement, any debris lodged in transferred assemblies must be removed. If…
- 10123587Jun 20, 2013Supersedes Technical Service Bulletin Group 19 number 13-35 dated March 25, 2013. Discontinuation and mixing of Audi-approved engine coolants. G11, G12, and G12+ coolants have…
Engine cooling: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2021 | 1 | 6% |
| 2016 | 2 | 4% |
| 2015 | 4 | 18% |
| 2014 | 1 | 2% |
| 2013 | 1 | 2% |
| 2012 | 3 | 5% |
| 2010 | 2 | 12% |
| 2008 | 3 | 4% |
| 2007 | 3 | 6% |
| 2006 | 2 | 3% |
| 2005 | 3 | 3% |
| 2004 | 3 | 9% |
| 2003 | 3 | 5% |
| 2002 | 15 | 17% |
| 2001 | 18 | 16% |
| 2000 | 21 | 14% |
| 1999 | 17 | 8% |
| 1998 | 6 | 5% |
| 1997 | 1 | 5% |
| 1996 | 2 | 4% |
| 1995 | 1 | 6% |
Other parts of the 2004 Audi A6
9 complaintsBrakes
4 complaintsAir bags
3 complaintsElectrical system
3 complaintsSeats
3 complaintsTires
3 complaintsWheels
3 complaintsElectronic stability control
2 complaintsExterior lighting
2 complaintsVehicle speed control
2 complaintsEngine
1 complaintsForward collision avoidance
1 complaints
← All problems reported for the 2004 Audi A6
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology