There are 3 stored owner reports matching the engine leading-label group for the 2004 Audi A6 in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 3 of 3 matching reports.
Open the full vehicle complaint log (all categories)TL* THE CONTACT OWNED A 2004 AUDI A6. WHILE DRIVING AT 20 MPH, SMOKE APPEARED FROM THE ENGINE COMPARTMENT AND THE VEHICLE CAUGHT FIRE. A POLICE REPORT WAS FILED AND THERE WERE NO INJURIES REPORTED. THE VEHICLE WAS DESTROYED. THE VEHICLE WAS NOT INCLUDED IN NHTSA CAMPAIGN NUMBER: 06V198000 (ELECTRICAL SYSTEM). THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 103,000.
REPLACED CYLINDER BANK 1 RIGHT SIDE! *TR
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. YET THE DEALER HAS DECLINED TO COVER REPLACEMENT BECAUSE THE "CHECK ENGINE" LIGHT WAS NOT ON. I WAS GIVEN A REPAIR ESTIMATE OF $2,400. *TR
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Aug 31, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.