Audi A4 B9 Door Window Regulator Lifter Electric Door Rear Left N/S 8W0839461A

Audi A4 B9 Door Window Regulator Lifter Electric Door Rear Left N/S is an original component from the Window regulators and motors group, designed for the rear left window in the Audi body. It ensures stable window guidance and proper cooperation with the lifting mechanism, which translates into comfort and predictable operation of the entire system.

Specifications and technical data

• SKU: 8W0839461A
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0839461A
• Substitutable numbers: 8W0839461A, 8W0 839 461 A
• Location on the vehicle: Rear, Left
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The regulator with the guide is responsible for the precise movement of the window in the rear left door, maintaining its correct position relative to the seals and the door frame. The element operates on a vertical axis, working in conjunction with the drive mechanism, ensuring the window moves smoothly without jamming or unwanted play.

Its placement in the rear left area of the body makes the component significant for both passenger comfort and cabin sealing, as well as the correct operation of the central window control system.

Construction and performance parameters

The regulator integrated with the guide creates a rigid, stable structure that handles the loads resulting from frequent opening and closing of the window. The solution used by Audi allows for:

• maintaining the window in the guidance axis without deformation,
• reducing noise and vibrations during mechanism operation,
• maintaining proper window pressure against the seals.

Thanks to the factory fit for the specific body model, the element works with the original mounting points in the door, which facilitates installation and service.

Benefits of using an original Audi component

Using an original Audi solution for window guidance allows for maintaining the factory operating parameters of the mechanism. Key advantages include:

• secure fit to the door structure – no need for modifications or adjusting mounting holes,
• consistency with the factory window control system,
• maintaining the correct window geometry relative to the bodywork.

The element from this group is particularly important in vehicles equipped with electric window controls, where improper guidance can result in drive overload or system operation errors.

Condition, installation, and service application

The product is offered as a used original component, which allows for an economical repair of the window system while maintaining compliance with factory specifications. In practice, this means the possibility of replacing a damaged regulator or guide without interfering with other door components.

During installation, it is recommended to:

• check the condition of the mounts in the door,
• verify the free movement of the window after installation,
• verify the operation of the mechanism throughout the full range of opening and closing.

Audi window regulators and motors – expansion and service

If you are planning a comprehensive repair or upgrade of the door area in your Audi and need other elements from the same group, such as guides, lifting mechanisms, or window drives, check the available parts in the Audi window regulators and motors category.

Additional technical support

When selecting consumables for vehicle systems – especially in the case of more complex sub-assemblies – it is worth knowing good practices related to purchasing used parts. You can read more about how to consciously approach the selection of key components and verify their origin in the article: Why it is worth buying used gearboxes and engines – facts instead of myths.