Audi, A6, C5, 2.5 TDI Quattro (2000-) Common Issues
1. Faulty Mass Airflow Sensor
Occurrence: 14%Cost to repair: $200Symptoms:
Poor engine performance, decreased power, rough idling
2. Faulty Oxygen Sensor
Occurrence: 12%Cost to repair: $300Symptoms:
Rough engine idle, poor fuel efficiency, error codes on the dashboard
3. Transmission Slippage
Occurrence: 11%Cost to repair: $800Symptoms:
Transmission slipping out of gear, unusual noises from the transmission, difficulty shifting gears
4. Faulty VGT (Variable Geometry Turbo) Vanes
Occurrence: 9%Cost to repair: $600Symptoms:
Poor engine performance, decreased power, loud turbo whine
5. Clogged or Faulty Fuel Pressure Regulator
Occurrence: 8%Cost to repair: $250Symptoms:
Poor engine performance, decreased power, rough idling, fuel system error codes on the dashboard
6. Faulty EGR (Exhaust Gas Recirculation) Valve
Occurrence: 7%Cost to repair: $400Symptoms:
Rough engine idle, poor fuel efficiency, increased emissions, error codes on the dashboard
7. Faulty PCV (Positive Crankcase Ventilation) System
Occurrence: 6%Cost to repair: $350Symptoms:
Oil leaks, poor engine performance, rough idling, decreased power
8. Faulty Fuel Injector
Occurrence: 5%Cost to repair: $450Symptoms:
Poor engine performance, decreased power, rough idling, fuel system error codes on the dashboard
9. Clogged or Faulty Intake Manifold
Occurrence: 4%Cost to repair: $550Symptoms:
Poor engine performance, decreased power, rough idling, unusual noises from the intake manifold
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