Audi A8 D4 4H Door Window Lifter Regulator Mechanism Rear Left N/S 4H0839461C

Audi A8 D4 4H Door Window Lifter Regulator Mechanism Rear Left N/S is an original component from the Window Regulators and Motors group, designed for the rear left body zone. It ensures stable window guidance, correct power transmission, and repeatable operation of the lifting and lowering system, which directly affects the vehicle's comfort.

Specifications and technical data

• SKU: 4H0839461C
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0839461C
• Substitutable numbers: 4H0839461C, 4H0 839 461 C
• Location on the vehicle: Rear, Left
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The presented window regulator mechanism is designed to operate in the rear left part of the body, in the rear passenger door. It is responsible for precise window guidance in the rails and for safely transferring torque from the drive to the window, ensuring smooth movement without jamming or excessive play.

As an original Audi component, the mechanism is structurally matched to the door geometry, mounting points, and the window's range of motion in the A8 D4 model. This reduces the risk of improper fitment, noise during driving, and uneven window closing.

Construction and technical characteristics

The window regulator mechanism in this model is based on a system of rails and cables working with an electric drive. This solution ensures:

• stable window guidance throughout the entire range of motion,
• even distribution of loads on the door structural elements,
• controlled window movement when operated from the driver's panel or the rear door switch.

The system has been developed for operation in the rear left door, which means appropriately selected cable lengths, placement of mounting points, and direction of operation relative to the door structure.

Benefits of using an original mechanism

Using an original window regulator mechanism in an Audi A8 D4 brings a number of practical operational benefits:

• Proper fit – the component is designed for the specific geometry of the rear left door, which facilitates installation and minimizes the need for modifications.
• Consistency with the factory electrical system – the mechanism works with the existing window control installation and comfort safety features.
• Stable window operation – a properly functioning regulator reduces the risk of misalignment, jamming, and excessive load on the seals.

In a premium class vehicle like the Audi A8, a functional window regulator mechanism is important not only for comfort but also for acoustic tightness and protecting the interior from moisture.

Component condition and service application

The mechanism comes from the secondary market, which allows for economical repair of the window system while maintaining the original design. This is a particularly beneficial solution in the event of a single regulator failure, when you want to maintain the factory vehicle specification without having to resort to replacements with uncertain parameters.

The component will work well both for a typical replacement of a damaged regulator and for broader service work within the rear door, where restoring full functionality of the window control on the left side is required.

Complementary Audi Window Regulators and Motors

If you are planning a comprehensive repair or upgrade of the door zone in your Audi and need other elements from the same group, such as guides, electric drives, or complete regulator assemblies, check the available parts in the Audi Window Regulators and Motors category.

Technical support and selection by OEM number

When selecting a window regulator mechanism for a specific version of the Audi A8 D4, it is crucial to verify compatibility by the OEM number and vehicle data. This avoids installation problems and ensures full compatibility with the factory window control system.

If you want to organize the parts selection process and learn practical tips on working with OEM numbers and vehicle data, it is worth reading the guide: how to choose the right car part by VIN and OEM number. Additionally, for users interested in a broader context of operation and service costs for premium cars, the article Emergency BMW E90 engines: check what can ruin your budget! may be helpful, which shows how proper selection and condition of components affect the total cost of vehicle maintenance.