Audi A8   Controls   Driving  Starting and stopping the engine
If the remote control key battery is exhausted or if radio interference or a system malfunction occurs, extra steps may be necessary in order to start the engine.
Important: The message Key not recognised. Hold back of key against marked area. See owner's manual. must be displayed and the indicator lamp must be lit.
Hold the remote control key vertically against the symbol  Fig. 1.
Press the brake pedal WARNING!.
Press the START ENGINE STOP button. The engine should start.
Drive to a qualified workshop soon and have the fault rectified.
Note
You can call up the driver message again by pressing the START ENGINE STOP button.

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