See also:

Removing the towing eye
  Loosen the towing eye and unscrew it.   Attach cover 1 to the bumper and press until it engages.   Place the towing eye in the vehicle tool kit. ...

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 ...

Removing a wheel
Unscrew the uppermost wheel bolt completely. Screw alignment bolt 1 into the thread instead of the wheel bolt. Unscrew the remaining wheel bolts fully. Do not place wheel bolts in sand ...