Audi A6 Quattro Repair and Maintenance

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

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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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Audi A6 Quattro Questions

my satellite radio stopped playing and i have a subscription. (1 answer)

the satellite was working fine and all of a sudden it stopped working. I called Sirius XM and they ran a refresh signal and nothing happened.

Can the computer be fried? (3 answers)

After a battery install, the car wouldnt excellerate. Mechanic ran diagnostic, but couldnt communicate to computer system at first. Then one code showed. Throttle body. Throttle body changed, brand new, still wont hold excelleration. Could it be a bad code and computer symstem is no good anymore?

rear window replacement (1 answer)

is a 1998 a6 station wagon rear window compatible with my 1999 a6 station wagon?

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Audi A6 Quattro Recalls

Fuel Hose Under Hood Leaks

An under hood fuel hose may degrade and begin to leak fuel. Dealers will replace the under hood fuel pump and fuel hose free of charge to resolve the concern.

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Audi A6 Quattro Reviews

For a year I took my a6 4.2 to the dealer several times because a low coolant light continued to come on. I eventually gave up on y40 mile round trip to Annapolis to DC for this problem. I just kept g12 coolant in the trunk. It eventually was fixed by a service shop that I took it to for oil leaks. Now I have another oil leak. But it only leaks when its parked over night. Another dealer s...
Some plastic fittings on the front passenger seat have failed. Several painted surfaces on the headlight switch, mirror switch and heating and A/C controls have worn off. The radio on/off button has come off. The front suspension needs relatively frequent repairs. The roads are terrible around here. Water pump and oil cooler replace at different times. The latter repair VERY expensive.
This is an Exciting lovely roomy car, and good mpg.on a drive 42 mpg, according to the in car computer. I need to buy a additional ignition key, and the Audi dealer wasn't £240.00. I hpope there is another way.

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