Operation Is Identical To:
WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, 2001 BMW X5, and 2000 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
Remove and install/replace complete locking cylinder from left or right front door, refer to 51 21 140 REMOVING AND INSTALLING/REPLACING COMPLETE LOCK CYLINDER .