2003 Audi A8 Quattro Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2003 Audi A8 Quattro

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2003 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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2003 Audi A8 Quattro Questions

Where is the daytime running light module located? (1 answer)

Have lost all running lights, but flashers, brakes, back up all work fine. Also lost "lights on" alarm, so assume control module. No current to fuses.

Check engine came on 2 days ago, checked all fluids, OK. Running smooth, BUT... (1 answer)

When I press the CHECK button and it runs thru its' routine, highlights "Rear Lights" as problem. Changed fuses which looked "scarred" but still no rear or side running lights?? Car has 79,000 miles, and plugs oil were done recently, so ??? Brake lights, back up work, fron...

Condensation from A/C in leaking into cabin cabin, constant gurgling (3 answers)

Just started a week ago, live in FL and when I turn hard left\right water leaks onto feet. Thank you kindly

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2003 Audi A8 Quattro Recalls

Recall 08V397000
VOLKSWAGEN IS RECALLING 13,900 MY 1996-2003 AUDI A8 VEHICLES EQUIPPED WITH A 5-SPEED AUTOMATIC TRANSMISSION. THE LOCKING CABLE MAY MOVE OUT OF POSITION OVER TIME. WITH THE LOCKING CABLE OUT OF POSITION, THE SHIFTER CAN BE MOVED OUT OF THE "PARK" POSITION EVEN IF THE IGNITION KEY IS NOT IN THE I...

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