Audi, A6, C8, 45 TDI Quattro (2018-) Common Issues
1. Coolant Leaks
Occurrence: 5%Cost to repair: $200Symptoms:
Visible signs of coolant leakage under the engine, low engine coolant levels, or a sweet smell coming from the engine
2. DTC U0121 - Coolant Temperature Sensor Circuit Malfunction
Occurrence: 8%Cost to repair: $1200Symptoms:
Check Engine Light on, P-code U0121 stored in the onboard computer
3. Oil Leaks
Occurrence: 12%Cost to repair: $600Symptoms:
Visible signs of oil leakage around the engine or underneath the vehicle
4. Faulty Rear Axle Bearing
Occurrence: 6%Cost to repair: $800Symptoms:
Unusual noise from the rear axle area when cornering or driving at speed
5. Turbocharger Failure
Occurrence: 9%Cost to repair: $1500Symptoms:
Loss of power, unusual noise from the turbo area, or overheating
6. DTC U0101 - Engine Mechanical Problem
Occurrence: 7%Cost to repair: $1000Symptoms:
Check Engine Light on, P-code U0101 stored in the onboard computer
7. Faulty Transmission Mounts
Occurrence: 11%Cost to repair: $400Symptoms:
Unusual vibrations or shaking from the transmission area
8. DTC C1218 - Body Control Module Fault
Occurrence: 4%Cost to repair: $900Symptoms:
Check Engine Light on, P-code C1218 stored in the onboard computer
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