2001 Audi A6 Quattro Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2001 Audi A6 Quattro

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2001 Audi A6 Quattro Problems

No Start after Refueling and Popping Noise from Trunk

Popping sounds from the rear of the vehicle may be heard moments after starting the engine, or when slowing to a stop. This noise is from the leak detection pump filling the fuel tank with air, and releasing to retest the system when it finds a fault. The sequence of faults identifying this issue are as follows:

  • Succession of loud pops from rear of vehicle
  • Pops go away, and fuel economy decreases 
  • Check engine light illuminates
  • OBD trouble code P2404 and/or P0441 is stored
  • Engine will not start after refueling (must crank for over 30 seconds)
  • Vibration when slowing to a stop

The cause is a valve which is mounted on the front of the intake manifold, commonly called the N80 valve, or EVAP system purge valve. The valve is designed to open under specific circumstances, but a worn valve will remain open at all times, preventing the pressurization of the fuel tank. 

Correction of the issue is to replace the N80 valve with the latest revision. 

Check Engine Light and/or Engine Overheating Due to Failed Thermostat

The thermostat may erratically stick open or closed. The can result in illumination of the Check Engine Light and/or engine overheating.

ABS Light Due to Control Module Failure

The anti-lock brake system (ABS) control module may fail causing the ABS light to illuminate. Failed modules should be replaced to restore ABS operation.

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2001 Audi A6 Quattro Questions

Everytime im driving and press the brakes my car stop (2 answers)

When Im driving and a ease on the brakes my car skirts and stop and locks up and when i try pressing the gas its as if my wheel locked up and won't move my car still stays on but I could literally be flooring it and it moves bearly then i have to go in to netrual and back to drive just to get...

what could be causing the car to bog down when it's going uphill and it stalls (1 answer)

I already replaced the catalytic converters,, but the problem continues.

My transmission will not move when putting it into any gear except reverse. (1 answer)

It will catch after a few seconds but when it is in first gear it will hardly move once it shifts into 2nd or after going above 20 mph it moves fine. It is an automatic or what I have heard people call it an auto manual.

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2001 Audi A6 Quattro Reviews

Rated
based on 2 customer reviews
2001 Audi report I bought this car from my next door neighbor who moved away with his daughter to a mid western state & I bet he's kick’n his donkey since he sold me this MACHINE. I replaced both cats at 67K (covered 100% by Audi). The breaks normal W & T, but now 3 of the 4 ball joints on the front passenger side need replacing now @ 91K. I changed the spark plugs & now back to premium growli...
At 54k the Quattro needed to be completely replaced (had to fight Audi to get some help with the $12K bill). Now with 130k, the Quattro is again showing signs of a problem. Local shop seems at a loss for what to do next. Engine, suspension & steering, interior are all AWESOME. Still tight as new and not a single squeak. Brakes are overly dusty and exhaust needed replacing at about 120k.

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