2006 Audi A8 Quattro Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2006 Audi A8 Quattro

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2006 Audi A8 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. 

Various Probelms Caused by Clogged Plenum Tray Drain

Clogged drains can allow rainwater to accumulate in the plenum tray (at the base of the windshield). The water may leak into the vehicle's interior, brake booster, or electrical components, which can lead to major problems. Our technicians recommend keeping the tray clear of leaves, pine needles, and other debris.

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.

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2006 Audi A8 Quattro Questions

why my audi a8 won't lift (1 answer)

ive notice a problem with the car level since its been cold.. when then weather got hotter it raised fine..then the other day i heard the compressor running none stop.. this morning the compressor is running but the back or front won't lift

my 2006 audi a8l won't raise front or back.. i hear the compressor running (1 answer)

put on standard but droops back to dynamic and front or rear won't raise.. what causes that a relay?

How do I replace the low beam driver side headlight bulb on an 06 a8? (1 answer)

Which bulb should I purchase?

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2006 Audi A8 Quattro Recalls

Air Bag Warning Light and Passenger Side Air Bag Off Lights May Come On

The air bag warning light and passenger side air bag off notification light may illuminate due to low battery voltage. If this occurs, the passenger air bag will not deploy in an accident. Dealers will reprogram the air bag control module software. The Audi recall number is JR. This recall began on December 5, 2006.

The Airbag Warning Light May Illuminate

A problem with the wiring harness may deactivate the front passenger air bag. The air bag warning light and the "passenger air bag off" message would appear, causing the air bag not to deploy in a frontal crash. Dealers will repair the wiring harness free of charge. The recall began November 30, 2005. The Volkswagen recall number is JJ.

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