Audi, A6, C6, 2.4 V6 (2004-) Common Issues
1. Faulty Oxygen Sensor
Occurrence: 15%Cost to repair: $300Symptoms:
Check Engine Light on, Rough idling
2. Catalytic Converter Failure
Occurrence: 12%Cost to repair: $1200Symptoms:
Reduced Power, Poor Fuel Economy
3. Vacuum Leaks
Occurrence: 11%Cost to repair: $250Symptoms:
Idle Issues, Difficulty Starting
4. Faulty Mass Airflow Sensor
Occurrence: 10%Cost to repair: $400Symptoms:
Rough Idling, Poor Engine Performance
5. Ignition Coil Failure
Occurrence: 9%Cost to repair: $180Symptoms:
Misfires, Reduced Power
6. Faulty Fuel Pressure Regulator
Occurrence: 8%Cost to repair: $600Symptoms:
Poor Engine Performance, Low Fuel Economy
7. Throttle Position Sensor Failure
Occurrence: 7%Cost to repair: $280Symptoms:
Rough Idling, Difficulty Starting
8. Faulty Coolant Temperature Sensor
Occurrence: 6%Cost to repair: $220Symptoms:
Engine Overheating, Poor Engine Performance
9. Fuel Injector Failure
Occurrence: 5%Cost to repair: $900Symptoms:
Poor Fuel Economy, Reduced Power
10. Timing Chain Tensioner Failure
Occurrence: 4%Cost to repair: $1100Symptoms:
Rough Idling, Difficulty Starting
11. Fuel Pump Failure
Occurrence: 3%Cost to repair: $800Symptoms:
Difficulty Starting, Poor Fuel Economy
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