Audi, A6, C4, 2.0 16v (1994-) Common Issues
1. Faulty OBD II connector
Occurrence: 15%Cost to repair: $300Symptoms:
Trouble codes appear in OBD-II reader
2. Bad Fuel sensor
Occurrence: 12%Cost to repair: $200Symptoms:
Engine stalling or surging, poor engine performance
3. Faulty Oxygen Sensor (Bank 1, Sensor 1)
Occurrence: 10%Cost to repair: $250Symptoms:
Poor engine performance, slow acceleration
4. Throttle body carbon buildup
Occurrence: 8%Cost to repair: $100Symptoms:
Surging or hesitation when accelerating
5. Faulty Idle Air Control (IAC) Valve
Occurrence: 7%Cost to repair: $220Symptoms:
Idling issues, rough engine performance
6. PCV system vacuum leaks
Occurrence: 6%Cost to repair: $280Symptoms:
Surging or hesitation when accelerating, poor engine performance
7. Faulty Mass Airflow Sensor (MAF)
Occurrence: 5%Cost to repair: $380Symptoms:
Poor engine performance, slow acceleration
8. Crankshaft position sensor failure
Occurrence: 4%Cost to repair: $420Symptoms:
Engine stalling or surging, poor engine performance
9. Faulty Knock Sensor (KS)
Occurrence: 3%Cost to repair: $320Symptoms:
Rough engine performance, hesitation when accelerating
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