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Home >> BMW >> 2024 >> M3 Competition >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Body Equipment -- Repair (1 Of 2) -- M3 (G80) >> 51 21 Door Locks, Handles, Fittings, Front >> 51 21 140 Removing and installing/replacing the complete lock cylinder on the left or right front door (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS) >> 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 

Follow-up work