Starting the vehicle with the spare keyStarting the vehicle with the spare key  - Remote control keys - Doors and windows - Controls - Audi A5 Owner's Manual - Audi A5

Glove box: Adapter for spare key
Glove box: Adapter for spare key

Inserting the spare key into the adapter
Inserting the spare key into the adapter

Ц Open the glove box and take out the adapter for the spare key -arrow-.
Ц Insert the spare key all the way into the adapter.

Please note that the key will only engage in one position.

Ц Press the spare key lightly into the adapter until you hear it click into place.
Ц Insert the adapter, spare key first, into the ignition lock.

You should now be able to start the engine in the usual way.