Audi A5/S5   Controls   Instruments and warning/indicator lamps  Warning and indicator lamps
If the warning lamp lights up or flashes, there is a fault in a safety system, such as the airbag or belt tensioner system.
Drive to a qualified workshop without delay and have the fault rectified.
WARNING!
Have the fault in the safety systems examined without delay; otherwise the systems may fail to trigger in an accident – this could result in serious or possibly fatal injury.

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