See also:

Restoring the factory settings
Press the and buttons simultaneously for approximately six seconds until the battery check lamp flashes twice. ...

Notes on towing a trailer
Important safety notes WARNING   When towing a trailer, incorrect equipment and driving style could cause you to lose control of the vehicle. Towing incorrectly or not observing this O ...

Important safety notes
WARNING The PARKTRONIC is a supplemental system. It is not intended to, nor does it replace, the need for extreme care. The responsibility during parking and other critical maneuvers always ...