Ford Focus Mk3 Front Door Lock Mechanism Right O/S Driver Side BM5A-A21812-CB

The Ford Focus Mk3 Front Door Lock Mechanism Right O/S Driver Side is an original component from the Locks and Latches group, designed for the driver's side. It ensures precise operation of the door locking system, proper integration with the central locking, and stable latching, which directly impacts the comfort and safety of vehicle use.

Specifications and technical data

• SKU: RHD-BM5A-A21812-CB
• Mark: Ford
• Condition: Used
• OEM Part Number: BM5A-A21812-CB
• Substitutable numbers: BM5A-A21812-CB, BM5AA21812CB, 2099454, BM5A-A21812-CG, BM5AA21812CG
• Part type: Door Lock
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock mechanism is dedicated to the front right door on the driver's side for the third-generation Ford Focus model. It is responsible for the mechanical latching of the door, interaction with the external and internal handle linkages, and integration with the central locking system and cabin controls. A properly selected door lock minimizes play, reduces unwanted noise while driving, and ensures repeatable, secure door closing. This is particularly important in daily operation, where the door is one of the most frequently used body components.

Construction and technical properties

The Ford Focus Mk3 Front Door Lock Mechanism Right O/S Driver Side has been designed as an OEM component, which means full compatibility with the factory door structure and the vehicle's electrical installation. The locking system works with factory linkages and wiring, ensuring that installation is orderly and predictable. The internal construction of the lock is based on a set of gears, springs, and latches, which are responsible for:

• stable door latching in several catch positions,
• interaction with the central locking and cabin controls,
• proper response to the movement of the external and internal handle,
• maintaining the appropriate closing force of the door. Thanks to its factory origin, the correct geometry of the mounts and compatibility with the original pillar striker are maintained, which translates into secure seating and predictable operation over a long period of use.

Benefits of using an original lock

Using an original mechanism from the Locks and Latches group in the Ford Focus Mk3 allows you to maintain the factory performance parameters of the door and central locking system. Compared to replacements, the OEM component offers:

• precise fit to the door structure and factory mounting points,
• consistent cooperation with vehicle electronics and remote control,
• repeatable mechanism operation during frequent opening and closing,
• reduced risk of problems with closing or accidental door opening. This solution is especially recommended for post-collision repairs, replacing a worn-out lock, or when dealing with central locking issues on the driver's side, when you want to maintain the factory standard of operation.

Condition, fitment, and reference numbers

The offered mechanism comes from the Ford parts line and is a used component, which allows you to combine a favorable purchase cost with maintaining the manufacturer's original specifications. The product has an assigned OEM part number and interchangeable numbers, allowing you to precisely verify its compatibility with a specific version of the Ford Focus Mk3 before installation. Before purchasing, it is worth comparing the markings with your existing component or the vehicle's service documentation. This facilitates the selection of the correct lock for a given body configuration and equipment, thereby reducing the risk of incorrect fitment.

Practical application and additional information

Replacing the front right door lock mechanism on the driver's side is recommended in situations where there are problems with latching, central locking, interior door locking, or if the lock has suffered mechanical damage. Installing an original component allows you to restore proper door functionality without the need for installation modifications or mounting adjustments. If you are planning a comprehensive repair or upgrade of the door and lock area in your Ford and need other components from the same group, such as cylinders, latches, or additional door mechanisms, check the available parts in the Ford Locks and Latches category. For users considering the choice between new and used locking system components, an article comparing the costs and durability of different solutions may be useful – more information can be found in the material: New or used? A comparison of costs and quality of car parts.