Audi, A6, C4, 2.5 TDI (1994-) Common Issues
1. Faulty O2 Sensor
Occurrence: 15%Cost to repair: $200Symptoms:
Rough idling, poor fuel economy
2. Diesel Particulate Filter (DPF) Clogging
Occurrence: 25%Cost to repair: $1000Symptoms:
Increased engine noise, reduced performance
3. Faulty Turbocharger
Occurrence: 12%Cost to repair: $1200Symptoms:
Loss of power, decreased fuel efficiency
4. Coolant Leak
Occurrence: 8%Cost to repair: $300Symptoms:
Overheating engine, greenish residue under the car
5. Faulty Fuel Pressure Regulator
Occurrence: 9%Cost to repair: $250Symptoms:
Poor fuel economy, stumbling engine
6. Worn or Loose Serpentine Belt
Occurrence: 18%Cost to repair: $180Symptoms:
Engine noise, reduced performance
7. Faulty Mass Airflow Sensor (MAF)
Occurrence: 11%Cost to repair: $220Symptoms:
Rough idling, poor fuel economy
8. Low Compression in One or More Cylinders
Occurrence: 13%Cost to repair: $800Symptoms:
Loss of power, decreased fuel efficiency
9. Faulty Engine Management Computer (ECU)
Occurrence: 7%Cost to repair: $900Symptoms:
Engine warning lights, intermittent stalling
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