Audi, A6, C7 Common Issues
1. Faulty Oxygen Sensor
Occurrence: 12.5%Cost to repair: $300Symptoms:
Rough engine idle, decreased fuel efficiency
2. Faulty Mass Airflow Sensor
Occurrence: 9.5%Cost to repair: $250Symptoms:
Decreased engine performance, rough engine idle
3. Transmission Problems (CVTTC)
Occurrence: 8.2%Cost to repair: $1000Symptoms:
Unpredictable shifting, slipping between gears
4. Faulty Fuel Injector
Occurrence: 7.9%Cost to repair: $450Symptoms:
Decreased engine performance, poor fuel efficiency
5. Coolant Leaks (Heater Core)
Occurrence: 6.5%Cost to repair: $200Symptoms:
Overheating engine, steam coming from the hood
6. Faulty Battery (Sensors and Charging System)
Occurrence: 5.8%Cost to repair: $120Symptoms:
Dead battery, faulty charging system
7. Rear Wheel Bearing Replacement
Occurrence: 5.2%Cost to repair: $600Symptoms:
Grinding noise from the rear wheels
8. Faulty Electronic Throttle Control (ETC) Sensor
Occurrence: 4.8%Cost to repair: $220Symptoms:
Decreased engine performance, faulty throttle response
9. Faulty Rear Axle Bushings
Occurrence: 4.5%Cost to repair: $800Symptoms:
Clunking noise from the rear axle
10. Fuel Pump Replacement
Occurrence: 3.9%Cost to repair: $900Symptoms:
Decreased engine performance, poor fuel efficiency
11. Faulty Engine Oil Pressure Sensor
Occurrence: 3.2%Cost to repair: $150Symptoms:
Engine oil pressure light on the dashboard
12. Rear Brake Pad Replacement
Occurrence: 2.8%Cost to repair: $400Symptoms:
Squealing noise from the rear brakes
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