Audi, A6, C5, S6 Quattro (1999-) Common Issues
1. Oil Leaks
Occurrence: 15%Cost to repair: $200Symptoms:
Leakage of oil from the engine, often around the valve cover gasket or oil pan gasket.
2. Transmission Solenoid Failure
Occurrence: 12%Cost to repair: $1200Symptoms:
Unusual noises while shifting gears, slipping transmission, difficulty engaging certain gears.
3. Engine Oil Pressure Sensor Fault
Occurrence: 8%Cost to repair: $300Symptoms:
Check engine light illuminated, oil pressure warning message on the dashboard.
4. Vacuum Leaks
Occurrence: 9%Cost to repair: $400Symptoms:
Rough idling, loss of power, unusual noises from the engine.
5. Faulty EGR Valve
Occurrence: 6%Cost to repair: $250Symptoms:
Check engine light illuminated, rough idling, decreased performance.
6. Coolant Leaks
Occurrence: 7%Cost to repair: $350Symptoms:
Leakage of coolant from the radiator, water pump or hoses.
7. Faulty Mass Airflow Sensor
Occurrence: 5%Cost to repair: $200Symptoms:
Check engine light illuminated, rough idling, decreased performance.
8. CV Boot Failure
Occurrence: 11%Cost to repair: $450Symptoms:
Unusual noises while driving, vibration in the steering wheel or wheels.
9. Faulty Rear Main Seal
Occurrence: 10%Cost to repair: $600Symptoms:
Leakage of oil from the rear main seal, often accompanied by noise and vibrations.
10. Faulty Fuel Injector
Occurrence: 8%Cost to repair: $450Symptoms:
Check engine light illuminated, decreased performance, unusual noises from the engine.