Ford Focus MK3 Window Regulator Mechanism Rear Left Door N/S BM51-A27001-AC

Ford Focus MK3 Window Regulator Mechanism Rear Left Door N/S is a factory-original component of the window lifting system, designed for the rear left side of the vehicle body. As part of the Window Regulators & Motors group, it ensures precise window guidance and stable operation of the entire mechanism. This used OEM component is a sensible choice for repairs when you want to maintain the original construction and correct door geometry.

Specifications and technical data

• SKU: BM51-A27001-AC
• Mark: Ford
• Condition: Used
• OEM Part Number: BM51-A27001-AC
• Substitutable numbers: BM51-A27001-AC, BM51A27001AC, 1769161
• Location on the vehicle: Rear, Left
• Part type: Window Regulator
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The presented mechanism operates in the rear left area of the vehicle body, responsible for the smooth raising and lowering of the passenger door window. The design is tailored to the architecture of the third-generation Ford Focus, which allows for maintaining the proper position of the window relative to the seals and the door frame.

By using an original solution, the following are maintained:

• stable window operation without excessive play,
• proper guidance in the tracks,
• correct compatibility with the factory electric control system.

Benefits of using the original mechanism

Using a window regulator mechanism dedicated to the Ford Focus MK3 helps avoid problems typical of aftermarket replacements, such as inaccurate fitment or accelerated wear of moving parts. The original mounting geometry facilitates installation and reduces the risk of stress on the door panel.

Key advantages include:

• compatibility with the factory electrical system – no need for installation modifications,
• preservation of the window operating characteristics designed by the manufacturer,
• consistency with other door components, such as seals and guides.

Component condition and service application

The mechanism comes from dismantling and is offered as a used part, which is a cost-effective service solution for maintenance repairs. This type of component is suitable both for replacing a damaged regulator after a failure and for restoring full door functionality after a collision or bodywork intervention.

Choosing an original, used component allows you to maintain the structural integrity of the vehicle while optimizing repair costs compared to new OEM parts.

Ford Window Regulators & Motors – expansion and repairs

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

Service knowledge and operation

When working with drive systems and vehicle maintenance, it is worth expanding your knowledge about typical faults and service costs. Practical information on critical power units can be found in the article BMW E90 engine failures: check what can ruin your budget!, which helps you better plan your car's technical maintenance.

If you are interested in a conscious approach to repairs using dismantled parts and want to better understand their impact on the environment and car operation, take a look at the guide Eco-tuning in practice: how to increase performance while reducing your carbon footprint with recycled parts, which describes the practical applications of recycled components in everyday driving.