Audi A4 B8 Rear Tailgate Hatch Boot Lid Inner Bulb Mount Left N/S 8K5945257J

Audi A4 B8 Rear Tailgate Hatch Boot Lid Inner Bulb Mount Left N/S is an original component from the Rear lights and brake lights group, designed for installation on the left side of the rear bodywork. It ensures a stable fit for the bulb in the tailgate, which translates into the proper operation of the rear lighting and clear signaling for other road users.

Specifications and technical data

• SKU: 8K5945257J
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K5945257J
• Substitutable numbers: 8K5945257J, 8K5 945 257 J
• Location on the vehicle: Rear, Left
• Category: Rear Light Assemblies

Purpose and function of the component

The presented bulb mount is dedicated to the rear, left part of the tailgate in the Audi A4 B8 generation. It is responsible for securely fastening the bulb in the housing, maintaining the correct position of the light source, and correctly transmitting light signals, such as the position light or brake light (depending on the lamp configuration in a given vehicle).

Thanks to its precise fit to the tailgate structure, this component allows for maintaining the factory geometry of the lighting system, which is important both for safety and for compliance with regulations regarding vehicle visibility on the road.

Construction and fitment for Audi

As an Audi brand part, the bulb mount has been designed for full compatibility with the electrical installation and mountings in the A4 B8 tailgate. Properly shaped sockets and clips allow for stable seating in the inner lamp without the need for modifications or forcing the component into place.

The arrangement of the contacts and the shape of the body are adapted to the factory wiring and housing, which facilitates installation and minimizes the risk of looseness, overheating of contacts, or unreliable electrical contact. This solution is particularly beneficial when replacing a damaged or melted mount in an existing lighting assembly.

Condition, service application, and benefits of installation

The item comes from the used parts group, which allows for an economical repair of the lighting system while maintaining the manufacturer's original specifications. This type of mount is often replaced in situations where there is mechanical damage to the housing, problems with keeping the bulb in the socket, or local overheating around the contacts.

Replacing the bulb mount with an original Audi component helps restore:

• stable bulb mounting in the tailgate,
• proper operation of the rear and brake lights on the left side,
• consistent appearance and functionality of the rear lighting assembly.

Why it is worth using an original bulb mount

Using an original bulb mount in the Audi A4 B8 reduces the risk of problems typical of aftermarket replacements, such as inaccurate fitment, loose contacts, or accelerated socket wear. This allows for maintaining stable lamp operating parameters, which is important for daily use and periodic technical inspections.

This solution is particularly recommended for local repairs, where only the inner mount has been damaged, while the remaining elements of the lamp remain in a condition suitable for further use. Replacing the mount itself allows for cost reduction while maintaining the factory character of the lighting system.

Related Audi lighting components

If you are planning a comprehensive repair or upgrade of the rear lighting zone in your Audi and need other elements from the same group, such as lenses, housings, or additional lamp modules, check the available parts in the Audi rear lights and brake lights category.

When planning broader service work, especially before the autumn-winter season, it is also worth verifying the condition of other vehicle components – you can find practical tips and checklists in the article Winter essentials: which used car parts are worth checking and replacing before the frost?.