Audi, A6, C5, 4.2 V8 Quattro (1999-) Common Issues
1. Faulty Mass Airflow Sensor
Occurrence: 15%Cost to repair: $200Symptoms:
Poor engine performance, rough idling
2. Crankshaft Position Sensor Failure
Occurrence: 20%Cost to repair: $300Symptoms:
Engine stalling, failure to start
3. Faulty Oxygen Sensor
Occurrence: 18%Cost to repair: $150Symptoms:
Reduced engine performance, decreased fuel efficiency
4. Catalytic Converter Failure
Occurrence: 22%Cost to repair: $1000Symptoms:
Pungent smell from exhaust system, decreased engine performance
5. Faulty Throttle Position Sensor
Occurrence: 12%Cost to repair: $250Symptoms:
Poor engine response to throttle input
6. Transmission Issues (Tiptronic)
Occurrence: 16%Cost to repair: $800Symptoms:
Slipping or hesitation between gear shifts, failure to engage certain gears
7. Faulty Engine Management Computer
Occurrence: 14%Cost to repair: $600Symptoms:
Engine performance issues, malfunctioning engine lights
8. Air Suspension Failure (Quattro)
Occurrence: 25%Cost to repair: $1200Symptoms:
Sagging or uneven ride height, reduced stability control effectiveness
9. Faulty Rear Wheel Bearing
Occurrence: 11%Cost to repair: $400Symptoms:
Vibration from rear wheels, grinding noise when turning
10. Front Control Arm Failure (Quattro)
Occurrence: 19%Cost to repair: $900Symptoms:
Uneven tire wear, reduced stability control effectiveness
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