Audi, A6, C4, 2.5 TDI 5sp (1994-) Common Issues
1. Engine Oil Leaks
Occurrence: 12%Cost to repair: $300Symptoms:
Oil stains under the engine or on the ground beneath the car
2. Faulty O2 Sensor
Occurrence: 15%Cost to repair: $200Symptoms:
Check Engine Light comes on, poor fuel efficiency, stalling
3. Clogged Diesel Particulate Filter (DPF)
Occurrence: 18%Cost to repair: $1200Symptoms:
Engine stalling, reduced power, excessive smoke from the exhaust
4. Faulty Mass Airflow Sensor
Occurrence: 11%Cost to repair: $250Symptoms:
Poor engine performance, reduced fuel efficiency, engine stumbling
5. VW Group Throttle Body Issues
Occurrence: 9%Cost to repair: $600Symptoms:
Stuttering engine, rough idling, difficulty starting the car
6. Faulty Front Oxygen Sensor
Occurrence: 10%Cost to repair: $350Symptoms:
Poor engine performance, reduced fuel efficiency, stalling
7. Rough Idle and Lack of Power
Occurrence: 13%Cost to repair: $450Symptoms:
Engine idles poorly, lacks power when accelerating
8. Clogged or Faulty Fuel Pressure Regulator
Occurrence: 8%Cost to repair: $900Symptoms:
Poor engine performance, difficulty starting the car
9. Faulty EGR Valve
Occurrence: 6%Cost to repair: $400Symptoms:
Rough idling, poor engine performance, excessive emissions
10. Timing Chain Tensioner Failure
Occurrence: 5%Cost to repair: $1000Symptoms:
Engine ticking noise, rough idling, difficulty starting the car
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