Ford Focus Mk3 Rear Window Regulator Mechanism Motor Right O/S BM51-A27000-BC

Ford Focus Mk3 Rear Window Regulator Mechanism Motor Right O/S is an original component from the Window Regulators and Motors group, designed for precise operation of the window on the rear right side of the vehicle body. This solution is created specifically for Ford models, ensuring proper cooperation with the factory electrical installation and stable window operation in daily use.

Specifications and technical data

• SKU: BM51-A27000-BC
• Mark: Ford
• Condition: Used
• OEM Part Number: BM51-A27000-BC
• Substitutable numbers: 1870371, BM51-A27000-BE, BM51A27000BE, BM51-A27000-BC, BM51A27000BC
• Location on the vehicle: Rear, Right
• Part type: Regulator & Motor Assembly
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The presented mechanism is dedicated for installation in the rear right part of the body, where it is responsible for the smooth raising and lowering of the window. As a component structurally matched to the Ford Focus Mk3, it works with the factory window controls, maintaining the correct window guidance geometry and stability of its position in the guides. Thanks to its proper design, the mechanism ensures:

• even window movement throughout the entire operating range,
• proper power transmission from the motor to the window,
• maintaining the window in the set position without unwanted play.

Construction and fitment for Ford Focus Mk3

The window regulator mechanism has been designed with the factory mounting points in the rear right door in mind. The appropriate placement of mounting holes and the shape of the load-bearing elements allow for installation without modifying the door structure. This is a plug-in solution within the mounting system, which facilitates service work and shortens replacement time. The original origin from the Ford brand means maintaining compliance with factory dimensional tolerances, which translates into proper fitment with the window, seals, and other door components.

Performance characteristics and installation benefits

The window regulator mechanism in the rear right part of the vehicle has a direct impact on passenger comfort and operational safety. A functional component allows for:

• secure closing of the window while driving,
• reduction of vibrations and noise coming from the door area,
• proper cooperation with the window control system in the rear doors. The used, original mechanism is often chosen as a reasonable alternative to replacements, as it retains factory operating parameters and fitment to the specific body model.

Selection by numbers and technical aspects

The element belongs to the Window Regulators and Motors group, which facilitates its identification in parts catalogs and service systems. The mechanism has an OEM part number and interchangeable numbers, thanks to which it can be precisely matched to a specific equipment version and vehicle year, minimizing the risk of error when ordering. In case of doubts during selection, it is worth using the manufacturer's markings and vehicle data to ensure full compatibility with the electrical installation and door structure.

Condition, application, and operation

As a used part, the mechanism is intended for installation in place of a worn or damaged regulator in the Ford Focus Mk3. Replacement of this component is recommended in situations where the window moves jerkily, jams, drops automatically, or does not respond correctly to commands from the switch. A properly selected and functional mechanism restores full functionality of the rear right window, which improves the comfort of daily vehicle operation. If you are planning a comprehensive repair or upgrade of the door and window zone in your Ford and need other elements from the same group, such as guides, window motors, or complete lifting mechanisms, check the available parts in the Ford Window Regulators and Motors category. To better understand when it pays to reach for parts from the secondary market and how to safely select them by OEM numbers, it is worth reading the guide Why it is worth buying used gearboxes and engines – facts instead of myths, which discusses practical principles of verifying used components and the approach to purchasing them.