

Audi, A6, C6, 2.7 TDI (2004-) Common Issues
1. Faulty Diesel Particulate Filter (DPF) regeneration
Occurrence: 30%Cost to repair: $1200Symptoms:
Check engine light on, decreased power and performance, increased fuel consumption.
2. Oil Leaks from Front Engine Mounts
Occurrence: 20%Cost to repair: $800Symptoms:
Leaking oil spots under the car, engine oil level decrease.
3. Faulty Mass Airflow Sensor (MAS)
Occurrence: 15%Cost to repair: $600Symptoms:
Check engine light on, rough engine idle, decreased power and performance.
4. Clogged Diesel Fuel Filter
Occurrence: 12%Cost to repair: $300Symptoms:
Difficulty starting the engine, reduced engine performance.
5. Faulty Oxygen Sensor (O2S)
Occurrence: 10%Cost to repair: $500Symptoms:
Check engine light on, rough engine idle, decreased power and performance.
6. Loose or Faulty Turbocharger V-Band Clamps
Occurrence: 8%Cost to repair: $400Symptoms:
Increased turbocharger noise, oil leaks from the turbocharger area.
7. Faulty Electronic Throttle Control Module (ETCM)
Occurrence: 6%Cost to repair: $900Symptoms:
Rough engine idle, decreased power and performance, erratic throttle response.
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