51 21 003 Replacing door detent (lock striker), front left or right

Release screws (1) and remove door detent (2).

Installation: 

If necessary, carry out basic adjustment by way of notches (3) on lock striker (2).

Notches (3) must be vertical to B-pillar.

Tightening torque 51 21 2AZ .

ADJUST LOCK STRIKER .

Fig 1: Identifying Notches On Lock Striker And Screws

Courtesy of BMW OF NORTH AMERICA, INC.