On certain vehicles, the tail lamps do not turn on when the daytime running lamps are on. New Canadian regulations require that, if a vehicle has dash backlighting, the tail lamps must automatically switch on when it is dark or must stay on at all times.
Driving without tail lamps in low light conditions could make the vehicle less visible and increase the risk of a crash.
Audi will notify owners by mail and instruct you to take your vehicle to a dealership to update the electrical system control unit.