Audi, A6, C5, 1.8 Turbo (2001-) Common Issues
1. Oil Leaks
Occurrence: 25%Cost to repair: $300Symptoms:
Leaks from oil pan gasket or valve cover gasket
2. Rattling Noises
Occurrence: 18%Cost to repair: $200Symptoms:
Rattles from engine mounts, timing chain tensioner or other components
3. Faulty Oxygen Sensor
Occurrence: 15%Cost to repair: $150Symptoms:
Fault codes P0138-P0171 and poor engine performance
4. Boost Pressure Issues
Occurrence: 12%Cost to repair: $400Symptoms:
Low or inconsistent boost pressure
5. Faulty Throttle Position Sensor
Occurrence: 10%Cost to repair: $100Symptoms:
Fault codes P0122-P0220 and rough engine performance
6. Turbocharger Failure
Occurrence: 8%Cost to repair: $800Symptoms:
Turbo boost gauge not moving or low boost pressure
7. Faulty Fuel Pressure Regulator
Occurrence: 6%Cost to repair: $250Symptoms:
Fault codes P0121-P0213 and poor engine performance
8. RPM Fluctuations
Occurrence: 5%Cost to repair: $300Symptoms:
Fluctuations in engine RPM while idling or driving
9. Coolant Leaks
Occurrence: 4%Cost to repair: $250Symptoms:
Leaks from radiator, hoses or water pump
10. Faulty Mass Airflow Sensor
Occurrence: 3%Cost to repair: $150Symptoms:
Fault codes P0100-P0115 and poor engine performance
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