Audi A4 B9 Rear Door Window Control Motor Mechanism Left N/S 8W0959811

Audi A4 B9 Rear Door Window Control Motor Mechanism Left N/S is an original component from the Window regulators and motors group, designed for operating the rear left window in the Audi A4 B9 generation model. The used motor ensures a factory fit, stable operation of the window lifting mechanism, and full functionality of the comfort system.

Specifications and technical data

• SKU: 8W0959811
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0959811
• Substitutable numbers: 8W0959811, 8W0 959 811
• Location on the vehicle: Rear, Left
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The presented motor is dedicated to installation in the rear left window area of the Audi A4 B9. It is responsible for driving the window regulator mechanism, allowing for smooth opening and closing of the window from the door panel or central control. Thanks to a design consistent with Audi's factory standards, the component works with the vehicle's electrical system and comfort systems without the need for modifying wiring or mounts.

Construction and technical fitment

The window regulator motor belongs to the Window regulators and motors group, which means it has been designed to work in the demanding conditions of car doors – under varying temperatures, humidity, and mechanical loads. The original construction ensures:

• compatibility with the factory window regulator mechanism in the Audi A4 B9,
• correct mounting points in the rear left door,
• proper electrical connector matched to the vehicle's installation.

As a result, the installation process is straightforward, without the need for adapters or modifications, which is important for both service centers and users performing DIY car maintenance.

Benefits of using an original motor

Using an original window regulator motor in the Audi A4 B9 translates into a number of practical benefits. The most important include:

• Stable operation of the window mechanism – the correct torque and operating speed reduce the risk of jams and regulator overloads.
• Full integration with vehicle electronics – maintaining comfort closing functions, anti-pinch protection (if present in the specific configuration), and cooperation with door modules.
• Time savings during installation – a plug-and-play component for the appropriate version of the Audi A4 B9, with no need for adjustments.
• Consistency with Audi's factory quality standards, which facilitates subsequent diagnostics and potential service.

Characteristics of the used component

The window regulator motor is offered as a used part, which is a reasonable compromise between repair costs and maintaining the manufacturer's original specifications. For many Audi users, this is a way to economically repair the window system while maintaining factory fitment and operating parameters. A used component from the Window regulators and motors group allows you to restore the functionality of the rear left window without having to invest in more expensive replacements of uncertain origin.

If you are planning a comprehensive repair or upgrade of the rear left door area in your Audi and need other components from the same group, such as drives, control modules, or complete regulator mechanisms, check the available parts in the Audi window regulators and motors category.

Practical installation and maintenance tips

When replacing the window regulator motor in the Audi A4 B9, it is worth paying attention to a few technical aspects:

• checking the mechanical condition of the regulator guides and cables before installing the new drive,
• inspecting the electrical wiring in the door for abrasions and contact corrosion,
• proper calibration of the window position after installation, if required by the comfort system.

Such an approach allows you to fully utilize the potential of the installed motor and reduce the risk of recurring faults in the near future.

Supplementary technical knowledge

For those interested in a broader context of premium car maintenance and the costs of potential repairs, a guide regarding engines in another popular premium segment model may be useful. For this purpose, it is worth reading the article: Faulty BMW E90 engines: check what can ruin your budget!, which shows how proper part selection and preventive maintenance affect the total cost of car ownership.