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.

For tightening torque refer to 51 21 2AZ  in 51 21 FRONT DOOR LOCKS .

Adjust Door Detent. 

Fig 1: Notches And Door Detent

Courtesy of BMW OF NORTH AMERICA, INC.