Audi , A6 , C8 , 55 TFSIe Quattro Competition (2021-) Common Issues
- Oil leaks due to compromised valve cover gasket seals (approximate frequency: 15-20%)
- Rear main seal oil leak (approximate frequency: 10-15%)
- Coolant leaks from the radiator and/or hoses (approximate frequency: 8-12%)
- Transmission software issues, leading to erratic shifting or failure to engage gears (approximate frequency: 7-10%)
- Battery drain and inability to start the vehicle due to faulty ECU and/or battery management system (BMS) (approximate frequency: 6-9%)
- Faulty hybrid powertrain system, causing issues with electric motor operation and regenerative braking (approximate frequency: 5-8%)
- Problems with the S-tronic transmission's automatic mode, failing to downshift or resulting in harsh shifting (approximate frequency: 4-7%)
- Issues with the Audi drive select system, affecting dynamics and performance settings (approximate frequency: 3-6%)
- Headlamp washers not functioning properly due to clogged washer nozzles or faulty pumps (approximate frequency: 2-5%)
- Rear differential oil leak, requiring replacement of the rear diff and associated components (approximate frequency: 1-4%)
- Issues with the advanced driver-assistance systems (ADAS), including problems with adaptive cruise control and lane departure warning (approximate frequency: 1-3%)
- Faulty hybrid battery cell due to high temperatures or extreme usage, leading to reduced performance and efficiency (approximate frequency: <1-2%)
- Failure of the Audi virtual exterior mirror (VEM) system due to faulty cameras or software glitches (approximate frequency: <1-2%)
- Rear spoiler detachment due to inadequate attachment screws or weakened materials (approximate frequency: <1-1%)
- Faulty turbocharger bearing, leading to premature wear and potential engine damage (approximate frequency: <0.5-1%)
- Engine oil consumption and excessive oil usage due to compromised piston rings or cylinder head gaskets (approximate frequency: <0.5-1%)
- Low-pressure fuel sensor failure, causing the engine to run rich and potentially leading to catalytic converter damage (approximate frequency: <0.5-1%)
- Failure of the rear parking sensors' ultrasonic transducers due to water ingress or corrosion (approximate frequency: <0.5-1%)
- Rear axle bearing wear, resulting in increased noise levels and potential bearing failure (approximate frequency: <0.5-1%)
- Incorrect engine calibration, leading to reduced performance and fuel efficiency (approximate frequency: <0.5-1%)
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