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

Necessary preliminary tasks: 

• Remove carrier for outer door handle. See REMOVING AND INSTALLING/REPLACING CARRIER FOR LEFT OR RIGHT OUTSIDE DOOR HANDLE WITHOUT LOCK CYLINDER .

Release screws (1).

Remove gearing cover (2).

Fig 1: Identifying Gearing Cover With Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Press down latch mechanism (1) slightly.

Turn lock cylinder (2) in direction of latch mechanism (1) and remove.

Fig 2: Turning Lock Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.