Audi, A6, C8, 45 TFSI (2019-) Common Issues
1. Faulty DTC U0128 - Loose or corroded battery cable
Occurrence: 15%Cost to repair: $200Symptoms:
Check engine light on, rough idle
2. Oil leaks from the front main bearing cap
Occurrence: 10%Cost to repair: $1000Symptoms:
Blue or brown oil stains under the car
3. Faulty S-tronic transmission control module (TCM) - DTC U0121, U0100, etc.
Occurrence: 8%Cost to repair: $1200Symptoms:
Transmission slipping, hesitation, or failure to engage gears
4. Rear main seal oil leak
Occurrence: 12%Cost to repair: $900Symptoms:
Oil spot under the rear of the car, engine oil consumption
5. Faulty adaptive cruise control module (ACCM) - DTC U0151, etc.
Occurrence: 7%Cost to repair: $1100Symptoms:
Adaptive cruise control malfunction or erratic behavior
6. SRS system issues - DTCs U0126, U0100, etc.
Occurrence: 9%Cost to repair: $800Symptoms:
Airbag light on, SRS warning messages in the infotainment system
7. Engine oil consumption
Occurrence: 11%Cost to repair: $750Symptoms:
Low engine oil level, blue or brown oil stains under the car
8. Faulty electronic differential lock (EDL) module - DTC U0121, etc.
Occurrence: 6%Cost to repair: $1050Symptoms:
Electronic differential lock malfunction or erratic behavior
9. Transmission mounts failure
Occurrence: 5%Cost to repair: $600Symptoms:
Clunking or banging noises from the transmission area
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