Audi, A6, C5, 1.9 TDI (1997-) Common Issues
1. Faulty Mass Airflow Sensor
Occurrence: 12%Cost to repair: $200Symptoms:
Check Engine Light on, Poor engine performance, Rough idling
2. Clogged or Faulty Diesel Particulate Filter (DPF)
Occurrence: 15%Cost to repair: $800Symptoms:
Reduced engine power, Increased fuel consumption, DPF warning light on
3. Faulty Oxygen Sensor
Occurrence: 8%Cost to repair: $300Symptoms:
Check Engine Light on, Poor engine performance, Rough idling
4. Failed EGR Valve
Occurrence: 9%Cost to repair: $400Symptoms:
Reduced engine power, Increased fuel consumption, Check Engine Light on
5. Faulty Turbocharger
Occurrence: 7%Cost to repair: $1500Symptoms:
Poor engine performance, Reduced boost pressure, Check Engine Light on
6. Failed Fuel Pressure Regulator
Occurrence: 6%Cost to repair: $600Symptoms:
Poor engine performance, Increased fuel consumption, Low fuel pressure warning light on
7. Faulty Coolant Temperature Sensor
Occurrence: 5%Cost to repair: $100Symptoms:
Coolant temperature gauge malfunctioning, Check Engine Light on
8. Faulty Throttle Position Sensor
Occurrence: 4%Cost to repair: $250Symptoms:
Poor engine performance, Reduced throttle response, Check Engine Light on
9. Failed Fuel Filter
Occurrence: 3%Cost to repair: $50Symptoms:
Reduced fuel pressure, Increased fuel consumption, Clogged fuel filter warning light on
10. Faulty Ignition Coils
Occurrence: 2%Cost to repair: $200Symptoms:
Misfires, Reduced engine power, Check Engine Light on
11. Crankshaft or Camshaft Position Sensor Failure
Occurrence: 1%Cost to repair: $300Symptoms:
Check Engine Light on, Poor engine performance, Engine stalling