Audi, A6, C6, 2.0 TFSI (2006-) Common Issues
1. Faulty O2 Sensor
Occurrence: 20%Cost to repair: $300Symptoms:
Rough idling, decreased engine performance
2. Timing Chain Tensioner Failure
Occurrence: 15%Cost to repair: $1200Symptoms:
Engine oil leaks, unusual noises from the engine compartment
3. Faulty Fuel Pressure Regulator
Occurrence: 12%Cost to repair: $800Symptoms:
Poor engine performance, decreased fuel efficiency
4. Coolant Leaks from the Water Pump
Occurrence: 10%Cost to repair: $600Symptoms:
Overheating engine, steam coming out of the radiator
5. Faulty Mass Airflow Sensor (MAF)
Occurrence: 8%Cost to repair: $250Symptoms:
Rough idling, decreased engine performance
6. VANOS Solenoid Valve Failure
Occurrence: 6%Cost to repair: $900Symptoms:
Unusual noises from the engine compartment, rough engine idle
7. Faulty Catalyst Converter
Occurrence: 5%Cost to repair: $1000Symptoms:
Decreased engine performance, check engine light illumination
8. PCV Valve Blockage or Failure
Occurrence: 4%Cost to repair: $200Symptoms:
Oil leaks from the valve cover gasket, unusual noises from the engine compartment
9. Faulty Fuel Injector
Occurrence: 3%Cost to repair: $700Symptoms:
Poor engine performance, decreased fuel efficiency
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