Audi, A6, C4, 1.8 5v (1995-) Common Issues
1. Vacuum Leaks
Occurrence: 15%Cost to repair: $300Symptoms:
Intake manifold gasket failure, resulting in rough idling and decreased performance.
2. Faulty Oxygen Sensor
Occurrence: 20%Cost to repair: $250Symptoms:
Rough idling, poor fuel efficiency, and 'check engine' light illumination.
3. Faulty Mass Airflow Sensor
Occurrence: 18%Cost to repair: $450Symptoms:
Rough idling, decreased performance, and sometimes a 'check engine' light.
4. Coolant Leaks
Occurrence: 12%Cost to repair: $400Symptoms:
Leaking coolant lines or radiator, resulting in overheating and engine damage.
5. Faulty Catalytic Converter
Occurrence: 25%Cost to repair: $1000Symptoms:
Failed emissions test due to excessive carbon monoxide and hydrocarbon emissions.
6. Faulty Fuel Pressure Regulator
Occurrence: 10%Cost to repair: $600Symptoms:
Rough idling, decreased performance, and sometimes a 'check engine' light.
7. Timing Belt Failure
Occurrence: 22%Cost to repair: $800Symptoms:
Engine failure due to improper timing and valvetrain operation.
8. Faulty PCV System
Occurrence: 8%Cost to repair: $350Symptoms:
Oil leaks, decreased performance, and sometimes a 'check engine' light.
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