Audi A3 8P Sportback Window Seal Door Rear Left N/S Gasket Frame 8P4839439B

Audi A3 8P Sportback Window Seal Door Rear Left N/S Gasket Frame is a precision-fitted body component designed for the rear left door area of the Audi A3 8P Sportback model. It is responsible for the tight seating of the window within the door frame, improving acoustic comfort, moisture protection, and the stability of the window regulator mechanism. Thanks to its factory origin from the Audi group, it maintains the correct geometry and compatibility with the door structure.

Specifications and technical data

• SKU: 8P4839439B
• Mark: Audi
• Condition: Used
• OEM Part Number: 8P4839439B
• Substitutable numbers: 8P4839439B, 8P4 839 439 B
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Purpose and function of the window frame seal

The presented seal is a component responsible for guiding and sealing the window in the rear left door. Its profile has been designed for the specific body structure of the Audi A3 8P Sportback, which allows for:

• limiting the ingress of water and contaminants into the door interior,
• reducing wind noise at higher speeds,
• stable window guidance in the track,
• maintaining proper pressure of the window against the frame.

As a result, the cabin's acoustic comfort remains at an appropriate level, and the interior is better protected against moisture and drafts.

Compatibility with the body and mounting zone

The seal has been prepared for installation in the rear left door, which means its shape, length, and mounting points are adapted to this specific position on the vehicle. In practice, this translates into:

• easier seating in factory slots and clips,
• proper adhesion to the door frame and window,
• no need for modifications or profile adjustments.

Such fitment is particularly important for post-collision repairs, replacing corroded door components, or eliminating leaks that appear over time.

Component characteristics and advantages of using an original part

The window frame seal from the Window seals and trims group is a structural element that operates under variable conditions – it is exposed to UV radiation, temperature changes, and window movement. Using an original Audi component allows you to maintain:

• material consistency with other body seals,
• proper stiffness and flexibility of the profile,
• compatibility with the factory window lifting mechanism.

This solution is especially recommended for repairs where maintaining factory sealing and fitment parameters is crucial, without the risks typical of generic replacements.

Condition, installation, and service application

The item is offered as a used part, which allows for an economical repair while maintaining the manufacturer's original specifications. In practice, the seal will prove useful in situations where:

• the existing seal is perished, cracked, or deformed,
• leaks, wind noise, or drafts appear in the doors,
• after body and paint repairs, it is necessary to restore the complete window sealing circuit.

With proper installation, you can achieve stable window guidance and improved sealing without interfering with the door structure.

Expanding the repair – Audi seals and trims

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

How to effectively source used body components

For larger repairs, it is worth planning your purchases to select all necessary components in one place – from seals and trims to small mounting elements. You can read about the practical aspects of this approach, the advantages of original used parts, and how to avoid problems with cheap replacements in the article Comprehensive supply: from the engine to the smallest clip – how to source used car parts in one place?.