Audi, A6, C5 Common Issues
1. Faulty Oxygen Sensor
Occurrence: 15%Cost to repair: $300Symptoms:
Poor engine performance, decreased fuel efficiency
2. Rough Idle
Occurrence: 12%Cost to repair: $200Symptoms:
Engine hesitates or stalls at idle
3. Faulty Mass Airflow Sensor
Occurrence: 11%Cost to repair: $250Symptoms:
Poor engine performance, decreased fuel efficiency
4. Transmission Solenoid Issues
Occurrence: 10%Cost to repair: $800Symptoms:
Difficulty shifting gears, slipping or hesitation in transmission
5. Faulty Fuel Pressure Regulator
Occurrence: 9%Cost to repair: $400Symptoms:
Poor engine performance, decreased fuel efficiency
6. Crankshaft Position Sensor Failure
Occurrence: 8.5%Cost to repair: $350Symptoms:
Engine hesitates or stalls, rough idle
7. Faulty Front O2 Sensor Heater
Occurrence: 8%Cost to repair: $180Symptoms:
Error codes for faulty front oxygen sensor heater
8. Fuel Pressure Regulator Leaks
Occurrence: 7.5%Cost to repair: $450Symptoms:
Leaks under the vehicle, decreased fuel efficiency
9. Faulty Rear Main Seal
Occurrence: 7%Cost to repair: $900Symptoms:
Oil leaks from rear of engine
10. Rear Axle Bearing Failure
Occurrence: 6.5%Cost to repair: $750Symptoms:
Grinding or whining noise when turning
11. Faulty Rear Oxygen Sensor
Occurrence: 6%Cost to repair: $220Symptoms:
Error codes for faulty rear oxygen sensor
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