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Home >> BMW >> 2021 >> M440i >> Repair and Diagnosis >> Body & Frame >> Mirrors >> Body Equipment -- Repair (G22, G23 & G26) (1 Of 3) >> 51 21 Front Door Locks, Handles, And Trim >> 51 21 140 Removing and installing/replacing the complete lock cylinder on the left or right front door (4' Series coupe and convertible models) >> Replacing lock cylinder

Replacing lock cylinder

WARNING: Working on 12 V electrical system  .
Risk of short circuits! Risk of fire! 
  • Make sure that there is no charger  connected to the jump start terminal in the engine compartment.
  • Detach battery ground lead from battery.
  • For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.
NOTE: Description is for left component only. Procedure on the right side is identical.

Preliminary work 

G14195506Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work