Audi, A6, C8, 40 TFSI (2021-) Common Issues
1. Rough Idle
Occurrence: 8%Cost to repair: $300Symptoms:
Check engine light on, poor engine performance
2. Coolant Leaks
Occurrence: 12%Cost to repair: $800Symptoms:
Green or yellow fluid leaks under the car
3. DTC C0400 - Engine Control Module (ECM) Fault
Occurrence: 6%Cost to repair: $200Symptoms:
Check engine light on, ECM error codes
4. DTC U0101 - Engine Power Relay Circuit Malfunction
Occurrence: 4%Cost to repair: $100Symptoms:
Engine not starting, battery drain
5. DTC P0606 - Internal Control Module Range/Performance Fault
Occurrence: 3%Cost to repair: $400Symptoms:
ECM error codes, engine performance issues
6. Oil Leaks at Valve Cover Gasket
Occurrence: 10%Cost to repair: $600Symptoms:
Oil spots on the ground, low oil level
7. Faulty Mass Airflow Sensor
Occurrence: 9%Cost to repair: $250Symptoms:
Check engine light on, poor engine performance
8. Clogged Fuel Injectors
Occurrence: 7%Cost to repair: $500Symptoms:
Poor engine performance, decreased fuel efficiency
9. Faulty Oxygen Sensor
Occurrence: 5%Cost to repair: $150Symptoms:
Check engine light on, poor engine performance
10. DTC P1345 - Engine Mechanical Issue
Occurrence: 2%Cost to repair: $700Symptoms:
ECM error codes, engine mechanical issues
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