Audi A4 S4 B8 Rear Quarter Window Glass Tinted Left N/S AS3 8K9845299D

Audi A4 S4 B8 Rear Quarter Window Glass Tinted Left N/S is an original component from the Car windows group, designed for installation in the rear left part of the vehicle body. The tinted glass improves driving comfort, reduces interior heating, and increases passenger privacy while maintaining factory geometry and fitment to the Audi bodywork.

Specifications and technical data

• SKU: 8K9845299D
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K9845299D
• Substitutable numbers: 8K9845299D, 8K9 845 299 D
• Location on the vehicle: Rear, Left
• Part type: Rear Quarter Window
• Category: Car Glass

Purpose and fitment for Audi

The presented window glass has been designed specifically for the Audi A4 / S4 B8 generation family, taking into account the characteristic body line and the manufacturer's structural requirements. Its placement in the rear left zone ensures full compatibility with factory seals, guides, and mounts, which facilitates installation and reduces the risk of leaks. By maintaining the original curvature and dimensions, the glass works correctly with the bodywork, without causing stress or unwanted noise while driving. This solution is particularly beneficial for post-accident repairs and when replacing worn or damaged glazing elements.

Characteristics of the AS3 tinted glass

The tinted glass in the AS3 standard provides increased protection against solar radiation and limits the heating of the vehicle interior. This type of glass:

• reduces the amount of light entering the cabin, improving visual comfort for passengers,
• reduces visibility of the interior from the outside, increasing the level of privacy,
• supports maintaining a more stable temperature in the rear part of the vehicle. At the same time, adequate transparency and safety of use are maintained, in accordance with the requirements for side windows installed in passenger cars.

Condition of the item and benefits of choosing a used part

The glass belongs to the group of used parts, which allows for combining reasonable repair costs with maintaining the original origin of the component. In practice, this means:

• factory fitment to the Audi body,
• consistent appearance with the rest of the vehicle's windows,
• the possibility of an economical replacement of a damaged element without sacrificing OEM quality. For many users of premium class cars, choosing a used window is a rational compromise between budget and maintaining the original vehicle specification.

Safety, installation, and practical application

The rear left side window plays an important role in the body structure – it affects lateral stiffness, passenger protection, and acoustic comfort. A correctly selected element from the Car windows group minimizes the risk of leaks, air noise, and problems with water drainage in the rear body area. During installation, it is recommended to use a professional glass service or a body shop that will ensure proper seating of the glass, surface preparation, and leak testing after the work is completed. This is particularly important in the case of premium segment vehicles, where precision of installation translates into overall comfort of use.

Repair expansion and additional information

If you are planning a comprehensive repair or upgrade of the side glazing zone in your Audi and need other elements from the same group, such as side door windows, rear side windows on the right side, or other glazing formats, check the available parts in the Audi car windows category. If you want to better understand why original used components for premium class cars are becoming an increasingly popular choice in the face of changes in the parts market, it is worth reading the article: Crisis in the new parts market? Why in 2026 used originals for premium cars are the hottest trend. This is a practical supplement to your knowledge when planning the repair or modernization of your Audi.