Front Door Latch: Service and Repair

51 21 090 Removing And Installing/Replacing Door Lock In Left Or Right Front Door

Special tools required:







Necessary preliminary work:
- Remove sound insulation in front door







Disengage Bowden cable (2) from outer door handle at marked position.

Installation note:
Driver's side only:
Make sure locking pin (1) is correctly seated in mounting of door lock (3).







Lever out locking rod (1) and set aside.
Unfasten plug connection (2) and disconnect.
Release screws (3).







Installation note:
- Insert door lock (1) and turn in screws (2) but do not tighten
- Slide special tool 51 2 190 into opened rotary striker until striker engages in first stage







Installation note:
- Pre-tension door lock (1) with knurled screw (2) until special tool 51 2 190 just contacts corner points (3)

IMPORTANT:
- To tension door lock (1), it is only permitted to tighten knurled screw (2) by a further 1 to 1.5 turns (max.) (risk of damage).
- Door lock seal must rest uniformly on inner door panel (water ingress).

- Tighten down door lock screws, tightening torque 51 21 1AZ.







Feed door lock (2) out past guide rail of power window regulator (1) via door aperture.