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 Audi A4 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 Audi A4 to a qualified workshop. Professional maintenance and the correct oil are important for your safety.