Faulty OCS sensor: Some owners have reported a faulty Outside Temperature Sensor (OCS) which can lead to a malfunctioning climate control system.
Software updates: A software update issue has been reported, causing problems with the infotainment system and engine performance.
Fuel filler door issues: Some 2021 Audi A6 C8 models have experienced problems with the fuel filler door, such as it not opening or closing properly.
Transmission hesitation: A small number of owners have reported a hesitation in gear shifting when accelerating from a standstill.
Rear window defroster malfunction: The rear window defroster has been known to malfunction on some 2021 Audi A6 C8 models.
Spare tire access issue: Some owners have encountered difficulties accessing the spare tire due to a misaligned or stuck hatch release mechanism.
Power door lock issues: A handful of owners have experienced problems with the power door locks, such as them not locking or unlocking properly.
Audio system static and distortion: A few owners have reported experiencing static and distortion from the audio system.
Infotainment system freezing: Some 2021 Audi A6 C8 models have been known to experience a frozen infotainment system screen.
Faulty adaptive cruise control: A small number of owners have experienced issues with the adaptive cruise control system, such as it malfunctioning or failing to engage.
Transmission slipping: A few owners have reported experiencing transmission slippage when accelerating from a standstill or decelerating.
Electrical system glitches: Some 2021 Audi A6 C8 models have experienced electrical system glitches, such as dashboard lights flickering or the audio system cutting out.
Cooling system leaks: A small number of owners have reported experiencing leaks in the cooling system, which can cause the engine to overheat.
Engine misfire: In rare cases, 2021 Audi A6 C8 models have experienced a misfiring engine, usually due to a faulty spark plug or ignition coil.
Rear axle bearing failure: There have been reports of rear axle bearing failure on some 2021 Audi A6 C8 models.
Hybrid system malfunction: A few owners have encountered issues with the hybrid system, such as it not charging properly or malfunctioning during certain driving conditions.
Note: These issues are based on owner-reported problems and may not be comprehensive or accurate for every individual vehicle.