Audi A4 B8 Window Lifter Rear Door Regulator Mechanism Right O/S 8K0839462C

Audi A4 B8 Window Lifter Rear Door Regulator Mechanism 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 door. It ensures stable window guidance, correct positioning, and repeatable operation of the lifting and lowering system, which directly affects the vehicle's comfort.

Specifications and technical data

• SKU: 8K0839462C
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0839462C
• Substitutable numbers: 8K0839462C, 8K0 839 462 C
• Location on the vehicle: Rear, Right
• Part type: Window Regulator
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The mechanism is designed for installation in the rear right section of the body, within the passenger door. It is responsible for transferring the drive from the window control system to the guides and window mounts, enabling smooth opening and closing. Thanks to its factory geometry and proper gear ratio selection, it ensures predictable window operation without excessive play or unwanted vibrations.

Construction and fitment for Audi

As a component dedicated to the Audi brand, the window regulator mechanism is structurally matched to the factory mounting points in the door, which facilitates installation and reduces the risk of improper fitment. The applied architecture of the guide system and window mounts is consistent with the solutions used in the A4 B8 series, which allows for maintaining the original window operating characteristics and compatibility with factory seals and door upholstery.

Benefits of using an original mechanism

Using an original window regulator mechanism in an Audi A4 B8 provides a number of practical benefits:

• maintaining the factory window guidance geometry and proper pressure against the seals,
• reducing the risk of jams, skipping, and uneven window operation,
• consistency with the factory window control system and electrical safety features,
• easier diagnostics during future door system inspections.

As a result, replacing a worn or damaged component with an original mechanism allows for restoring proper window operation without the need for system modifications or interference with the door structure.

Condition, origin, and technical aspects

The offered item is used, which in practice means it comes from vehicle dismantling and has been verified for suitability for further use. For many users, this is a technically sound choice – it allows for maintaining the original vehicle specification while optimizing repair costs. The mechanism should be installed in accordance with the manufacturer's procedures, paying attention to the correct positioning of the cable, guides, and proper tightening of the mounting points.

Part selection by numbers and technical support

For precise selection of the window regulator mechanism, it is worth using the manufacturer's markings, such as the OEM part number and available interchangeable numbers. This helps avoid ordering errors and ensures full compatibility with the specific door equipment version. In case of doubt, the selection can be additionally verified by the Vehicle Identification Number (VIN) in service catalogs.

If you want to better understand how to safely use components from dismantling and how professional part selection by catalog numbers works, the following expert guide will be useful: Why it is worth buying used gearboxes and engines – facts instead of myths. The procedures and examples contained therein can be analogously applied to the selection of other subassemblies, including window system components.

Expanding repairs within the Audi window system

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