Ford Focus St-2 Mk3 Window Motor Rear Lifter Regulator Right O/S BM51-A27000-BE

Ford Focus St-2 Mk3 Window Motor Rear Lifter Regulator Right O/S is an original component from the Window Regulators and Motors group, designed for precise operation of the window in the rear right section of the vehicle body. This used OEM component ensures proper compatibility with the factory electrical system, maintaining stable operation of the window lifting and lowering mechanism. It is a practical solution for drivers who want to restore full window functionality without compromising on fitment.

Specifications and technical data

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

Purpose and function of the window regulator

The presented regulator is dedicated to installation in the rear right part of the vehicle, where it is responsible for the smooth guidance of the window in the rails and keeping it stable in the selected position. Thanks to a design that complies with Ford's factory standards, the component works with the original control motor and door control buttons, which translates into predictable and repeatable system operation.

A properly selected window regulator is crucial for vehicle comfort, reducing cabin noise, and ensuring body tightness. Using an OEM part helps avoid issues with improper fitment, slow operation, or the window getting stuck in extreme positions.

Benefits of using an original Ford component

Using an original regulator in a Ford Focus St-2 Mk3 primarily offers:

• a secure fit to the door structure and factory mounting points,
• consistent cooperation with the electrical system and window controls,
• maintenance of the factory operating characteristics of the window mechanism,
• reduction of the risk of additional modifications or adjustments to the component.

As a result, the installation process is straightforward, and after replacement, the window operates in a manner similar to the factory standard. For many users, this is an important advantage – especially in cars with a more dynamic character, such as the ST-2 version, where both functionality and maintaining the original vehicle specification are valued.

Installation and performance characteristics

The regulator designed for the rear right side of the vehicle has been engineered to work with the factory mounting system and window guide. The appropriate placement of mounting points facilitates the work for a mechanic or service technician, and the replacement process itself can be carried out without interfering with the door structure.

The used component retains the functionality required for daily operation – it allows for repeated raising and lowering of the window, ensuring stable guidance of the glass pane. This is a practical solution for drivers who want to restore the efficiency of the window system at a reasonable cost, while benefiting from a part originating from Ford's original production line.

Why consider a used window regulator

Choosing a used window regulator is a sensible compromise between cost and maintaining original quality. Parts of this type, sourced from dismantling, often still have significant operational potential while allowing for cost savings compared to purchasing a new component. An additional benefit is the environmental aspect – reusing functional components reduces waste and the burden on production processes.

If you would like to learn more about the arguments for choosing used components, selection procedures based on identification numbers, and real cost differences, it is worth checking out our expert guide: Why it is worth buying used gearboxes and engines – facts instead of myths. Although it mainly concerns powertrains, the principles presented there also help in taking a conscious approach to purchasing other used car parts.

Ford Window Regulators and Motors – expansion and service of the window area

If you are planning a comprehensive repair or upgrade of the side window area in your Ford and need other elements from the same group, such as lifting mechanisms, electric drives, or complete control modules, check out the available parts in the Ford Window Regulators and Motors category.