►Audi A3 ►Controls and displays ►Instruments and warning/indicator lamps ◀Warning and indicator lamps
If the indicator lamp 
lights up or flashes, a fault has occurred which can reduce the quality of the exhaust gas and damage the catalytic converter.
lights up or flashes, a fault has occurred which can reduce the quality of the exhaust gas and damage the catalytic converter.Drive slowly to a qualified workshop without delay and have the fault rectified.