1999 Audi A4 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1999 Audi A4
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1999 Audi A4 ProblemsEngine Misfire Due to Failed Ignition Coil, Spark Plug, or Ignition Wire
An ignition coil or spark plug may fail unexpectedly resulting in an engine misfire and possible illumination of the Check Engine Light. Vehicles equipped with spark plug wires may also develop a misfire caused by a failed spark plug wire.
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 A4 QuestionsWhen driving the engine of my Audi misfires and stalls. (1 answer)
When this first happened the codes that came up were P0300, P0301, P0303, P0304 and P0116. These codes cleared after read. Replaced coils 2 & 3 but the car still misfires and stalls. It idles fine. There is no local mechanic familiar with Audi's. Thinking the other 2 coils are still b...
The factory alarm keeps going off on my audi a4 especially when it gets above 100 degrees outside. What could be causing this?
when driving for about 5km it show oil light warning and engine makes some noise