Audi A4 B8 Window Lifter Rear Door Left N/S Regulator Mechanism 8K0839461A

Audi A4 B8 Window Lifter Rear Door Left N/S Regulator Mechanism is an original component from the Window regulators and motors group, designed for precise operation of the rear left window in your Audi. The design, matched to factory mounting points, ensures stable mechanism operation and predictable window behavior during daily use.

Specifications and technical data

• SKU: 8K0839461A
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0839461A
• Substitutable numbers: 8K0839461A, 8K0 839 461 A
• Location on the vehicle: Rear, Left
• Category: Window Motors & Regulators

Purpose and function of the window lifter

The presented window lifter is responsible for the smooth raising and lowering of the window in the rear left part of the vehicle body. The component works with the factory control system, ensuring proper operation of the door buttons and the comfort closing function, if present in the vehicle. Proper window guidance limits skewing, reduces stress on seals, and improves door sealing.

The placement on the vehicle in the rear left zone requires the use of the correct design variant, which is why selecting a dedicated window lifter is crucial for proper installation and the durability of the entire mechanism.

Construction and fitment for Audi

The window lifter has been designed specifically for the Audi A4 B8 platform, which translates into the correct placement of mounting points, guides, and components interacting with the window. Thanks to this, installation proceeds in an orderly manner, without the need for bodywork modifications or interference with the door structure.

The original origin from the Audi brand means compliance with factory quality standards, as well as compatibility with other door components, such as seals, guides, or the electrical harness. The mechanism is prepared to work with the appropriate control motor from the same part group, which facilitates service and diagnostics.

Condition, verification, and benefits of installation

The item comes from the secondary market and has a used status, which allows for combining reasonable repair costs with the preservation of the original technical specification. This type of solution is particularly beneficial for complex door repairs, where both fitment and the economics of the entire undertaking matter.

A properly selected rear left window lifter reduces the risk of jamming, uneven movement, and excessive play, which can lead to noise and accelerated wear of the seals. Installing an original mechanism helps restore acoustic comfort in the interior and correct window operation across the full range of motion.

Audi window regulators and motors – expansion and service

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

Part selection by numbers and expert knowledge

When selecting elements such as window lifters, motors, or other drive components, it is worth using manufacturer markings and reference numbers to avoid installation errors and compatibility issues. Similar rules apply when choosing drive subassemblies, where precise identification by numbers is of key importance for the durability and safety of the system.

If you want to better understand how professional selection of used subassemblies by OEM numbers looks and what the real economic benefits of using parts from the secondary market are, it is worth reaching for an expert guide: Why it is worth buying used gearboxes and engines – facts instead of myths.