Audi A4 B9 Rear Inner Window Weatherstrip Rubber Seal Gasket Left N/S 8W0839479

Audi A4 B9 Rear Inner Window Weatherstrip Rubber Seal Gasket Left N/S is a precision body component responsible for effectively draining water from the glass surface and reducing noise and vibrations. Thanks to its factory fitment for the rear left window in the Audi A4 B9, it ensures stable window operation, improved sealing, and an aesthetic window edge finish. This original used part is a sensible choice for professional repairs or replacing a worn-out seal.

Specifications and technical data

• SKU: 8W0839479
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0839479
• Substitutable numbers: 8W0839479, 8W0 839 479
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Function and role of the window weatherstrip seal

The inner window weatherstrip seal for the rear left window in the Audi A4 B9 works directly at the interface between the glass and the door panel. Its tasks include:

• mechanically wiping water and contaminants from the glass surface during raising and lowering,
• limiting moisture ingress into the door interior,
• reducing rattling, vibrations, and window play in the guide channel,
• maintaining a stable window position relative to the door frame.

Thanks to this component, the window lifting system operates more quietly, and the vehicle interior is better protected against moisture and dirt.

Construction and fitment for Audi A4 B9

The seal in question belongs to the Window seals and trims group, meaning it has been specifically designed to work in the area of the window edge and door. The seal profile is matched to the rear left side of the body, which facilitates installation and ensures proper adhesion to the glass and the door panel.

Its original Audi origin translates into maintaining factory assembly tolerances, correct edge geometry, and a consistent appearance with other door trim elements. This is particularly important for post-accident repairs or replacing worn seals, where compatibility with the factory window guidance system is crucial.

Benefits of using an original seal

Using an inner weatherstrip seal dedicated to the Audi A4 B9 provides a range of practical operational benefits:

• more stable operation of the window lifting mechanism thanks to proper guidance within the door plane,
• reduced risk of fogging and dampness inside the door, which promotes the durability of mechanisms and electrical installations,
• reduction of wind noise and minor rattling coming from the window area while driving,
• aesthetic finish of the window edge, consistent with the rest of the body components.

For users who care about the technical and visual condition of their vehicle, this is a practical service solution that allows for restoring factory window performance without compromising on fitment.

Vehicle placement and service application

The seal is intended for installation in the rear left part of the body, in the area of the door and side window. Such clear placement facilitates the selection of the correct component during bodywork repairs, glass replacement, or window regulator regeneration.

The item will prove useful both for standard replacement of a worn seal and for more extensive renovation work, where it is necessary to restore proper sealing and smooth window operation throughout the entire vehicle.

Expanding upgrades within Audi windows and seals

If you are planning a comprehensive repair or upgrade of the side window and window edge area in your Audi and need other components from the same group, such as additional seals, trim strips, or inner weatherstrip profiles, check out the available parts in the Audi window seals and trims category.

Support for modifications and repairs with used components

When planning repairs or modifications using used components, it is worth paying attention to selecting parts with verified origins and proper fitment for the specific model. Additional tips on the safe use of used components in a car can be found in the article Tuning with used parts – how to gain performance without spending a fortune, which discusses a practical approach to such upgrades.