Problems · NHTSA complaints

2004 Audi A6 problems

Owners filed 35 complaints about the 2004 Audi A6 with NHTSA between Apr 2004 and Dec 2023. The most-cited component is fuel system, gasoline (5).

Complaints
35
Filed with NHTSA
Crashes
1
Reported by owners
Fires
2
Reported by owners
Injuries
1
People reported injured
Deaths
0
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Fuel system, gasoline5
  2. Fuel/propulsion system3
  3. Electrical system3
  4. Engine and engine cooling3
  5. Air bags3
  6. Seats3
  7. Wheels3
  8. Tires3
  9. Service brakes2
  10. Electronic stability control (esc)2
  11. Vehicle speed control2
  12. Exterior lighting2
  13. Service brakes, hydraulic2
  14. Forward collision avoidance1

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

Data from NHTSA Complaints API · synced Oct 29, 2026NHTSA vehicle page
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20041
20053
20062
20072
20080
20096
20105
20115
20122
20131
20141
20153
20161
20171
20181
20190
20200
20210
20220
20231

Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.

03 —Owner reports

Top problems in owners’ words

Verbatim from NHTSA complaints, newest first

Fuel system, gasoline

5 reports1 related recall
“SIGNIFICANT GAS LEAK CAUSED BY BROKEN GAS "IN TANK SENDING UNITS" HOUSING AND SEAL. GAS WILL LEAK AND FILL THE INSIDE OF THE CAR WITH FUMS AS WELL AS UNDER THE CAR. REPLACEMENT REQUIRED BUYING A REVISED DESIGN SENDING UNITS THAT INCLUDE ALL THREE SENDING UNITS. THE PRICE IS HIGH ~$500 AND THE CONSEQUENCES VERY DANGEROUS. MY CAR IS: 2004 AUDI A6 [XXX] 2004 A6Q 2.7T *TR”
Owner complaint to NHTSAFiled Dec 10, 2013Fuel system, gasoline, EquipmentODI 10555455

Fuel/propulsion system

3 reports
“RE: SAFETY RECALL 20L8/JY; 08V157000: FUEL TANK ROLLOVER VALVE MODIFICATION; VIN: (XX); 2004 AUDI A6 3.0L QUATTRO AT5 ATTACHED DOCS: 1. 20L8/JY RECALL NOTICE. 2. 7.14.2008 & 11.18.18 AUDI N. SCOTTSDALE, AZ DEALER INVOICES 3. AUDI A6 GAS TANK DIAGRAM. AUDI CORP EMAIL RESPONSE: "AT THIS TIME WE HAVE IDENTIFIED THAT THE 20L8 REPAIR WAS SPECIFIC TO THE DRIVER'S SIDE OF THE VEHICLE. THE DEALERSHIP IS INDICATING THIS CURRENT RECOMMENDED REPAIR IS SPECIFIC TO THE PASSENGER SIDE OF THE VEHICLE." "SINCE WE ARE SHOWING THE 20L8 COMPLETED IN JULY OF 2008 AND THE ORIGINAL 20L8 REPAIR IS SPECIFIC TO DRIVER'S SIDE ROLLOVER NIPPLE VALVES, ACCORDING TO THE DEALERSHIP THIS CURRENT REPAIR IS UNRELATED TO THE RECALL." "CURRENTLY PER THE NHTSA WEBSITE, THE 20L8 IS NOT SHOWING AS AN OPEN RECALL, SO I WOULD BE UNABLE TO SPEAK TO HOW THEY WOULD REACT TO INFORMATION REGARDING A CLOSED RECALL." 'WE HAVE NO EVIDENCE SUPPORTING AN INCORRECT REPAIR BEING PERFORMED IN JULY OF 2008, SO AT THIS TIME WE WOULD BE UNABLE TO PROVIDE ASSISTANCE TOWARDS THIS REPAIR." CURRENT EMISSIONS CHECK ENGINE LIGHT (NOV 18, 2018) IS DIAGNOSED BY THE AUDI DEALER AS A GAS TANK LEAK. ALSO, THERE IS A STRONG ODOR…”
Owner complaint to NHTSAFiled Dec 9, 2018Fuel/propulsion systemODI 11157093

Electrical system

3 reports1 fire2 related recalls
“AFTERMARKET RADIO: PIONEER ELECTRONICS AVH-4100 NEX BACKUP CAMERA FAILS AND DISTRACTS DRIVER SIGNIFICANTLY. I HAVE ATTACHED A SCAN OF THE COMPLAINT TO PIONEER ELECTRONICS. THE RADIO LIKELY HAS SOFTWARE DEFECT THAT CAUSES VERY DISTRACTING FAILURES WHEN OPERATING THE BACK-UP CAMERA. PIONEER ADVERTISES THAT THIS BACKUP CAMERA WORKS AS ADVERTISED - IT IS ACTUALLY NOW A DISTRACTION AND HAZARD. AS WELL, OPERATING GOOGLE "ANDROID AUTO" CAUSES MORE SIGNIFICANT DRIVING DISTRACTIONS WHEN USING THE BACKUP CAMERA FUNCTION OF THE AVH-4100. COMPLAINTS TO PIONEER ELECTRONICS HAVE BEEN FRUITLESS. THEY SEEM TO BE ARROGANT AND CLAIM: "ALL OF OUR PRODUCTS ARE THOROUGHLY TESTED." I WOULD LIKE PIONEER ELECTRONICS TO FIX THE SOFTWARE ISSUE AND CREATE A NEW RELEASE THAT ALLOWS THE BACKUP CAMERA TO WORK WITHOUT A DISTRACTION AND SAFTY-HAZARD.”
Owner complaint to NHTSAFiled Jul 25, 2017Electrical systemODI 11010494

Engine and engine cooling

3 reports1 crash
“REPLACED CYLINDER BANK 1 RIGHT SIDE! *TR”
Owner complaint to NHTSAFiled Feb 14, 2012Engine and engine coolingODI 10447875

Air bags

3 reports1 crash
“TL*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. THE CONTACT SUFFERED INJURIES TO THE COLLAR BONE, RIBS, A CONCUSSION, AND LOST TEETH. THE DEALER STATED THAT THERE COULD HAVE BEEN A PROBLEM WITH THE COMPUTER. THE VEHICLE WAS DESTROYED. THE CURRENT AND FAILURE MILEAGES WERE APPROXIMATELY 190,000. UPDATED 04/08/11”
Owner complaint to NHTSAFiled Jan 20, 2011Service brakes, hydraulic, Engine and engine cooling, Air bagsCrash reportedODI 10377974

Seats

3 reports
“I FILED A COMPLAINT ABOUT MY 2004 AUDI A6 IN DEC OF 2009. I REPORTED THAT MY BACK PASSENGER SEAT HAD ALMOST CAUGHT FIRE, AND WAS BURNT. BOTH MY SEAT CUSHION AND UPPER BACK CUSHION WERE BURNED. AT THE TIME I HAD NOT CONTACTED AUDI, YET FILED A COMPLAINT, BECAUSE I FELT AND STILL DO THAT THIS WAS A MAJOR SAFETY HAZARD. SINCE MY LAST COMPLAINT I DID CONTACT BOTH MY DEALERSHIP (ROTH AUDI IN ERIE, PA) AND AUDI HEADQUARTERS AKA: AUDI CUSTOMER RELATIONS. THEY WERE VERY WILLING TO WORK WITH ME, SEEMED EXTREMELY CONCERNED AND SAID NOT TO WORRY BECAUSE I STILL HAD A WARRANTY LEFT ON MY CAR. WELL AFTER THE CAR RETURNED HOME FROM THE DEALERSHIP THEY ONLY FIXED HALF OF THE PROBLEM! THE DEALERSHIP SAID AUDI TOLD THEM TO REPLACE THE BOTTOM CUSHION ONLY. THE DEALERSHIP PAINTED OVER THE TOP CUSHION AND I FOUND THIS OUT AFTER I BEGAN WIPING MY SEAT, BECAUSE I THOUGHT I HAD SMUDGE MARKS ON IT... NOPE PAINT WAS COMING OFF AND COULD SEE THE BURNED SEAT UNDERNEATH THE PAINT. I CALLED AUDI BACK, AND THEY HAD ME TAKE IT BACK TO THE DEALER TO BE ASSESSED AGAIN. AFTER 6 DAYS OR SO THE PERSON I HAD BEEN DEALING WITH FROM AUDI CUSTOMER RELATIONS CALLED TO SAY WE CANT REPLACE THAT PART OF…”
Owner complaint to NHTSAFiled Apr 22, 2010SeatsODI 10326935
Data from NHTSA Complaints API (owner reports, unverified) · synced Oct 29, 2026

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.