Ford Focus MK3 Door Lock Latch Catch Actuator Front Left N/S BM5A-A21813-DB

Ford Focus MK3 Door Lock Latch Catch Actuator Front Left N/S is an original component from the Locks and latches group, designed for precise operation of the locking mechanism on the passenger side (N/S) of the vehicle body. This used door actuator and latch ensures a factory fit for installation in a Ford, maintaining proper cooperation with the handle, rods, and central locking electronics.

Specifications and technical data

• SKU: RHD-BM5A-A21813-DB
• Mark: Ford
• Condition: Used
• OEM Part Number: BM5A-A21813-DB
• Substitutable numbers: BM5A-A21813-DB, BM5AA21813DB, 2759553, BM5A-A21813-DH, BM5AA21813DH
• Location on the vehicle: Front, Left
• Part type: Door Lock
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock is dedicated for installation in the front left door of the Ford Focus MK3, on the passenger side in the right-hand drive version. It is responsible for the mechanical locking of the door leaf and transferring movement from the external and internal handle to the latch mechanism, as well as for cooperation with the central locking actuator. Its placement in the front left zone allows for proper integration with the factory electrical harness, window guides, and seals, without the need for any modifications to the door structure. This ensures that the correct closing geometry and appropriate pressure of the door leaf against the body frame are maintained.

Construction and technical compatibility

The element combines a mechanical latch with an electric actuator in one housing, creating a complete module responsible for opening, closing, and locking the door. The design provided by the manufacturer, Ford, enables:

• stable mounting to the internal door structure,
• proper routing of handle rods and the lock,
• correct positioning relative to the striker in the body pillar,
• consistent cooperation with the central locking system and remote control operation. By using an original solution from the Locks and latches group, compliance with factory assembly tolerances and operating parameters intended for the Ford Focus MK3 is maintained.

Benefits of using an original lock

Choosing this front left door lock allows you to reduce the risk of problems typical of replacements, such as incomplete closing, handle play, or unstable actuator operation. The original design ensures:

• secure door locking when working with the factory striker in the pillar,
• consistent operation with the existing central locking system,
• easier diagnostics in the event of potential electrical system faults,
• the possibility of direct replacement of the damaged module without modifications. This solution is particularly beneficial for post-accident repairs, mechanical door damage, or locking problems on the passenger side.

Condition, installation, and service recommendations

The offered lock is a used original Ford component, which in practice means maintaining factory geometry, mounting points, and compatibility with other door sub-assemblies. Before installation, it is recommended to perform a standard check of the electrical harness, the condition of the plugs, and the routing of the rods to ensure smooth operation of the entire system. During installation, it is worth paying attention to:

• correct positioning of the handle rods and internal lock,
• precise alignment of the lock with the striker in the pillar,
• testing the central locking operation from the remote control and the internal button,
• checking door tightness after reassembling the upholstery.

Repair expansion and additional materials

If you are planning a comprehensive repair or upgrade of the cabin access security zone in your Ford and need other elements from the same group, such as actuators, cylinders, or locking mechanisms, check the available parts in the Ford Locks and latches category. For users who are simultaneously servicing other vehicle systems and want to better plan the selection of used OEM components, the guide article Air conditioning and heating – parts selection and maintenance for year-round comfort, which describes a practical approach to parts selection and maintenance schedules, may be helpful.