See also:

The concept
The automatic engine start-stop function helps save fuel. The system switches off the engine during a stop, e. g., in a traffic congestion or at traffic lights. The ignition remains switched on. ...

Issued warning
If you leave the lane and if a lane marking has been detected, the steering wheel begins vibrating. If the turn signal is set before changing the lane, a warning is not issued. End of warning T ...

Malfunction
A message is displayed in the instrument cluster. HDC is not available, e.g., due to elevated brake temperatures. ...