51 21 003 Replacing Door Detent (Lock Striker), Front Left Or Right

Release screws (1) and remove door detent (3).

Installation: 

Basic adjustment via crosswire on B-pillar (4) and notches (2) on door detent (3).

Tightening torque: 51 21 3AZ  . See FRONT DOOR LOCKS for specs.

ADJUST DOOR DETENT .

Fig 1: Identifying B-Pillar, Notches And Door Detent

Courtesy of BMW OF NORTH AMERICA, INC.