Audi, A6, C4, 2.5 TDI 140 Quattro (1995-) Common Issues
1. Faulty Mass Airflow Sensor
Occurrence: 20%Cost to repair: $200Symptoms:
Poor engine performance, reduced power output
2. Turbocharger Oil Leaks
Occurrence: 18%Cost to repair: $800Symptoms:
Whining or grinding noise from the turbo, blue smoke emanating from the exhaust
3. Clogged Diesel Particulate Filter (DPF)
Occurrence: 15%Cost to repair: $1200Symptoms:
Reduced power output, increased engine noise, Check Engine Light illuminated
4. Fuel System Problems
Occurrence: 12%Cost to repair: $900Symptoms:
Poor engine performance, hesitation when accelerating
5. Coolant Leaks from Water Pump or Radiator
Occurrence: 10%Cost to repair: $600Symptoms:
Overheating engine, Coolant leaks under the car
6. Faulty Variable Vane Turbo (VVT)
Occurrence: 8%Cost to repair: $1000Symptoms:
Reduced power output, excessive fuel consumption
7. Transmission Problems
Occurrence: 7%Cost to repair: $1500Symptoms:
Slipping or hesitation when shifting gears, Check Engine Light illuminated
8. Rear Main Seal Leaks
Occurrence: 6%Cost to repair: $800Symptoms:
Oil leaks under the car, Reduced power output
9. Faulty Front Axle Shaft or Bearing
Occurrence: 5%Cost to repair: $1000Symptoms:
Vibration when driving, Grinding noise from the front axle
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