See also:

Messages after trip completion
Malfunctions indicated during a trip are displayed again after the ignition is switched off. ...

Ignition on
button, and do not press on the brake pedal at the same time. Manual-shift transmission: press the Start/Stop button, and do not press on the clutch pedal at the same time. All vehicle systems ...

The concept
Pressing the Start/Stop button switches the ignition on or off and starts the engine. Automatic transmission: the engine starts if the brake is depressed when the Start/Stop button is presse ...