1999 Audi A6 Quattro Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1999 Audi A6 Quattro
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1999 Audi A6 Quattro ProblemsNo 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.
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.
1999 Audi A6 Quattro QuestionsCan 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?
is a 1998 a6 station wagon rear window compatible with my 1999 a6 station wagon?
I was told the timing belt could be the cause or the spark. the Previous owner said the engine went out while it was running. I need to know the steps to fixing it and if it will be an easy process or too expensive.