Audi, A8, D3, 4.0 TDI Quattro (2004-) Common Issues
1. Rough idling and stumbling
Occurrence: 12%Cost to repair: $420Symptoms:
Stumbling, rough idling, poor engine performance when cold
2. Transmission solenoid failure
Occurrence: 9%Cost to repair: $1000Symptoms:
Slipping or hesitation in transmission, difficulty shifting gears
3. Electronic throttle body (ETB) issues
Occurrence: 8%Cost to repair: $650Symptoms:
Difficulty in accelerating, erratic ETB behavior
4. Fuel system leaks
Occurrence: 7%Cost to repair: $320Symptoms:
Strong fuel odor, fuel leaking from the car's underside, engine performance problems
5. Crankshaft or camshaft position sensor issues
Occurrence: 6%Cost to repair: $450Symptoms:
Fault codes related to crankshaft or camshaft position sensors, erratic engine behavior
6. Oxygen Sensor failure
Occurrence: 5%Cost to repair: $200Symptoms:
Fault codes related to oxygen sensors, poor engine performance, decreased fuel efficiency
7. Rear main seal leak
Occurrence: 4%Cost to repair: $1200Symptoms:
Strong oil smell in the car's interior, low engine oil levels, difficulty starting the engine when hot
8. Rust or corrosion issues (common on Quattro models)
Occurrence: 3%Cost to repair: $1500Symptoms:
Visible rust or corrosion spots under the car's body panels, water leaks into the cabin, electrical system malfunctions
9. Fuel filter clogging or failure
Occurrence: 2%Cost to repair: $90Symptoms:
Difficulty starting the engine when cold, erratic fuel flow, decreased fuel efficiency
10. Faulty air mass sensor
Occurrence: 1%Cost to repair: $180Symptoms:
Erratic engine performance, poor fuel economy, difficulty in accelerating