Ford Focus Mk3 Front Door Lock Latch Catch Mechanism Left N/S BM5A-A21813-DF

Ford Focus Mk3 Front Door Lock Latch Catch Mechanism Left N/S is an original locking mechanism designed for installation on the passenger side in right-hand drive versions. It ensures precise closing, stable locking, and secure retention of the door in the closed position, which translates into safe and predictable central locking operation in daily use. This solution is dedicated to factory installation in the third-generation Focus body, without the need for structural modifications.

Specifications and technical data

• SKU: RHD-BM5A-A21813-DF-1
• Mark: Ford
• Condition: Used
• OEM Part Number: BM5A-A21813-DF
• Substitutable numbers: 2759553, BM5A-A21813-DF, BM5AA21813DF, BM5AA21813DH, BM5A-A21813-DH
• Location on the vehicle: Front, Left
• Part type: Door Lock
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock mechanism is the component responsible for mechanically locking and unlocking the front left door in the Ford Focus Mk3. It works in conjunction with the external and internal handles and the central locking control system, transferring the movement of rods and actuators to the lock latch. Its placement in the front section, on the left side of the body, ensures proper fitment to the door structure and factory mounting points.

Construction and compatibility

The mechanism belongs to the body component group known as Locks and Latches, responsible for physically securing the door against uncontrolled opening. Using an original Ford solution allows for maintaining compatibility with the factory locking system, including rod geometry, striker position, and handle operation. As a result, the lock works with the existing electrical and mechanical installation without the need for adaptation.

Performance characteristics

As a used component, the Ford Focus Mk3 Front Door Lock Latch Catch Mechanism Left N/S is a practical service solution that allows for restoring proper door operation while maintaining a favorable cost-to-functionality ratio. The mechanism is intended for installation in place of the factory lock, which facilitates workshop work and reduces repair time. Proper alignment relative to the pillar and door striker minimizes the risk of play, rattling, or closing issues.

Application in repairs and diagnostics

Replacement of this component is recommended in the event of symptoms such as:

• lack of door response to central locking commands,
• problems with opening from the inside or outside,
• irregular locking or spontaneous unlocking,
• mechanical damage to the housing or the lock latch. Selecting an original lock dedicated to a specific position on the vehicle reduces the risk of improper fitment and premature wear of cooperating components in the door.

Expanding the scope of repairs – Ford Locks and Latches

If you are planning a comprehensive repair or upgrade of the door area in your Ford and need other components from the same group, such as rear lock mechanisms, tailgate latches, or door strikers, check the available parts in the Ford Locks and Latches category. To better plan service work on the body and systems cooperating with the vehicle's electronics, it is also worth familiarizing yourself with practical tips regarding the impact of temperature and operating loads on car components – you will find them in the article Engine cooling system – overheating, repair, and used radiators, which helps to look at car repairs in a holistic way.