Ford Transit Custom Rear Door Lock Lower Left N/S BK21-V431A03-AJ

Ford Transit Custom Rear Door Lock Lower Left is an original component from the Locks and latches category, designed for the rear, left side of the vehicle body. This used OEM part ensures factory-standard fitment, proper operation with the door mechanism, and stable locking of the rear doors, which translates into safe operation of the commercial vehicle.

Specifications and technical data

• SKU: BK21-V431A03-AJ
• Mark: Ford
• Condition: Used
• OEM Part Number: BK21-V431A03-AJ
• Substitutable numbers: BK21-V431A03-AJ, BK21V431A03AJ, 2319658, BK21-V431A03-AN
• Location on the vehicle: Rear, Left
• Part type: Door Lock
• Category: Exterior Locks & Lock Hardware

Purpose and vehicle placement

The presented lock is designed for installation in the rear, left side of the Ford Transit Custom door, in the lower area of the door leaf. It is responsible for the mechanical locking of the door and works in conjunction with other components of the locking system, which is particularly important in heavily used commercial vehicles.

Thanks to its dedicated placement in the rear area, on the driver's side, this component ensures proper guidance and locking of the door leaf, reducing the risk of play, improper closing, or accidental opening while driving.

Construction and OEM fitment

Original Ford branding means maintaining factory design parameters, mounting geometry, and compatibility with standard hinges, rods, and the door handle mechanism. The lock works with the factory opening and closing system without the need for modifications or adaptations.

The precisely manufactured housing and internal locking mechanism are adapted to the loads typical of commercial vehicles, where the rear doors are frequently opened and closed during loading. The used part retains its functionality while providing an economical solution compared to a new OEM component.

Function in the door locking system

The Ford Transit Custom Rear Door Lock Lower Left plays a key role in stabilizing the door leaf from the bottom, working with the upper mounting points and other latches. A properly functioning mechanism:

• ensures secure locking of the door in the closed position,
• minimizes vibrations and noise coming from the rear of the vehicle body,
• protects the cargo against accidental door opening while driving,
• maintains the tightness of the rear body area against dust and moisture.

By maintaining factory operating parameters, the lock integrates with the existing door adjustment system, which facilitates setting the correct position of the door leaf relative to the body.

Benefits of using an original lock

Choosing a used, original lock for the Ford Transit Custom allows you to combine reasonable repair costs with the quality intended by the vehicle manufacturer. The most important advantages include:

• Factory fitment – compliance with mounting points and door geometry, without the need for modifications.
• Stable mechanism operation – correct locking and unlocking using standard handles and rods.
• Appropriate operational durability – construction designed for use in a commercial vehicle.
• Consistency with other locking system components – no compatibility issues typical of cheap replacements.

Professional selection and additional information

To correctly select the lock for a specific version of the Ford Transit Custom, it is worth verifying the markings in the vehicle's technical specification and comparing the placement of the component with the currently installed lock. Using a part from the Locks and latches group that complies with factory parameters reduces the risk of door closing problems and accelerated hinge wear.

If you are planning a comprehensive repair or modernization of the rear door area in your Ford and need other components from the same group, such as locking mechanisms, cylinders, or strikers, check the available parts in the Ford Locks and latches category.

For a better understanding of the differences between original components and cheaper replacements, as well as the impact of part quality on vehicle safety, it is worth reading the guide: Original lamps or replacements? Check why used headlights are a guarantee of safety and perfect lighting.