Audi A4   Controls   Instruments and warning/indicator lamps  Warning and indicator lamps
Sport differential: system fault
There is a malfunction in the sport differential.
Drive to a qualified workshop soon and have the fault rectified.
Sport differential: overheating
The vehicle has been driven hard, causing the differential temperature to rise significantly. You should avoid performance driving until the temperature drops to the normal level and the indicator lamp goes out.
WARNING!
If a fault or malfunction occurs in the sport differential, take the vehicle to a qualified workshop. Professional maintenance and the correct oil are important for your safety.

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