Audi, A6, C4, 2.8 5v Quattro (1995-) Common Issues
1. Faulty VANOS solenoids
Occurrence: 15%Cost to repair: $1200Symptoms:
Engine misfire, rough idle
2. Faulty Oxygen Sensors
Occurrence: 8%Cost to repair: $200Symptoms:
Poor engine performance, high emissions
3. Faulty Mass Airflow Sensor
Occurrence: 12%Cost to repair: $400Symptoms:
Poor engine performance, difficulty starting
4. Coolant leaks from water pump or hoses
Occurrence: 22%Cost to repair: $800Symptoms:
Overheating engine, low coolant level
5. Faulty Alternator
Occurrence: 10%Cost to repair: $600Symptoms:
Battery warning lights, electrical system issues
6. Faulty Spark Plugs
Occurrence: 18%Cost to repair: $300Symptoms:
Poor engine performance, rough idle
7. Transmission problems (5-speed Tiptronic)
Occurrence: 12%Cost to repair: $1000Symptoms:
Slipping or hesitation when shifting gears
8. Faulty Fuel Injectors
Occurrence: 8%Cost to repair: $900Symptoms:
Poor engine performance, fuel system issues
9. Faulty Throttle Position Sensor (TPS)
Occurrence: 6%Cost to repair: $250Symptoms:
Poor engine performance, rough idle
10. Rear axle or differential problems
Occurrence: 10%Cost to repair: $1000Symptoms:
Clunking or grinding noises from rear of vehicle
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