51 71 ... Removing and installing/replacing front (bottom) right wheel arch trim
WARNING: This page is about a different car, the 2005 BMW 545i and 2004 BMW 545i. However, it is still accessible from the selected car via links, so may be relevant.
Turn steering wheel/front wheel to left.
Release screws (1).
Remove wheel arch trim (2) under assembly underside protection at side rear.
Fig 1: Identifying Wheel Arch Trim Retaining Screws