See also:

Activating/deactivating
The control panel is activated by pressing MODE when the audio system is switched on. It is switched off automatically when the audio system is switched off or by a long press on MODE. ...

Oil volume
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Incoming calls
Press OK/MENU (or the thumb wheel on the steering wheel keypad) to answer a call, even if the infotainment system is currently in another mode (e.g., RADIO or MEDIA). Press EXIT to reject a call. ...