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 door detent (2).

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

Tightening torque 51 21 2AZ  , see 51 21 FRONT DOOR LOCKS HANDLES .

Adjust door detent  , see 41 5.... ADJUSTING DOOR .

Fig 1: Identifying Screws, Door Detent And Notches

Courtesy of BMW OF NORTH AMERICA, INC.