2008 Audi A6 Quattro Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2008 Audi A6 Quattro

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2008 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.

Inspect CV Boots and Joints at Each Service

Our technicians recommend having the constant velocity (CV) boots and CV joints inspected at each service. Servicing torn CV boots early can prevent the need to replace the CV half shaft or CV joint.

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2008 Audi A6 Quattro Questions

My check engine light just came on/engine shakes when I start it. (1 answer)

When I start the car it sounds like I have my foot on the gas and the engine rocks a little. Any helpful answer would be great.

Internal Computer Shows that Tire Air Pressure is not between 38-42 Lbs. (1 answer)

I pumped 38 Lbs. in Front Tires and 42 Lbs in Rear Tires, and
waited 1 Hr. to register to load in to Computer.
Than switched to accept the Information for over a 1/2 Hr.,
BUT the "small" Indicator in the Odometer are still stays on and
every time I start the Engine it BE-e-e-Ps and...

tune up oil change radiator flush (1 answer)

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2008 Audi A6 Quattro Reviews

Rated
based on 1 customer reviews
Rear seat belt tab dissapeared into the retractor cover never to be seen again. Can't find an easy way to pull it back out unless one takes appart all of the trim panels. Any suggestions??

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