51 21 140 Removing and installing/replacing complete lock cylinder in left or right front door

WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Remove OUTSIDE HANDLE ON FRONT DOOR

Release screws (1).

Remove gearing cover (2).

Fig 1: Identifying Gearing Cover With Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Detach retaining clip (1).

Remove lock cylinder (2).

Fig 2: Removing Lock Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.