51 21 090 Removing and installing/replacing door lock in left or right front door

Special tools required:

Necessary preliminary tasks:

Unfasten plug connection (1) and disconnect.

Fig 1: Identifying Plug Connection

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Release screws (1).

Tightening torque 51 21 1AZ .

Remove door lock (2) inwards.

Fig 2: Identifying Door Lock And Screws

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Replacement only:

Detach cable (1) and remount.

Fig 3: Identifying Cable

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Installation note:

Install door lock (1) and screw in screws (2) but to not tighten.

Slide special tool 51 2 190 into opened rotary striker until striker engages in first stage

Fig 4: Sliding Special Tool (51 2 190) Into Opened Rotary Striker

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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).

Fig 5: Installing Door Lock With Knurled Screw Using Special Tool (51 2 190)

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Tighten screws of door lock (1).

Observe tightening sequence: bottom - top - inner.

Tightening torque 51 21 1AZ .