Audi A6 C6 Avant Rear Inner Left N/S Bulb Holder Socket Tail Gate 4F9945221A

Audi A6 C6 Avant Rear Inner Left N/S Bulb Holder Socket Tail Gate is an original rear lighting system component designed for installation in the tailgate. It ensures secure bulb seating and proper electrical connection, which translates into efficient operation of position and brake lights and compliance with safety requirements. It is a practical solution for users who want to restore full functionality of the rear lighting after damage or wear of the factory socket.

Specifications and technical data

• SKU: 4F9945221A
• Mark: Audi
• Condition: Used
• OEM Part Number: 4F9945221A
• Substitutable numbers: 4F9945221A, 4F9 945 221 A
• Location on the vehicle: Rear, Left
• Category: Rear Light Assemblies

Purpose and function in the lighting system

The offered bulb holder is a component from the Rear lights and brake lights group, mounted in the rear part of the vehicle on the left side. It is responsible for:

• mechanical mounting of bulbs in the tailgate,
• ensuring a stable electrical contact,
• proper operation of position lights, brake lights, and any additional functions provided in the lamp,
• maintaining the correct arrangement of light points in accordance with vehicle homologation.

Thanks to its fitment for the specific Audi A6 C6 Avant model, the holder works with the factory wiring harness and the original tailgate lamp, which facilitates service and reduces the risk of compatibility issues.

Construction and fitment to Audi

As an Audi brand component, the bulb holder has been designed for precise fitment with the tailgate structure and the factory headlight. Properly shaped sockets and contacts allow for:

• secure bulb seating without looseness or vibrations,
• easy installation and removal during service bulb replacement,
• maintaining the correct position of light sources relative to reflectors and the lens.

Such a solution promotes uniform light distribution and maintains clear signaling for other road users, which is important for both driving comfort and safety.

Condition, service application, and benefits of installation

The item is offered in used condition, which is a cost-effective service solution for Audi A6 C6 Avant owners who want to reduce repair costs while maintaining the original design. Replacing a damaged bulb holder with a functional equivalent allows you to:

• eliminate problems with flickering or non-functioning rear lights,
• minimize the risk of overheating and burning contacts associated with makeshift repairs,
• restore the factory standard of the electrical installation in the tailgate.

Using original, used lighting components is particularly important in vehicles where maintaining the technical and visual consistency of the entire rear system is essential.

The importance of original used parts

In the case of components such as bulb holders in rear lamps, using original Audi components helps maintain the correct operating parameters of the electrical system and reduces the risk of failures resulting from inaccurate fitment of aftermarket replacements. It is worth remembering that choosing the right, factory-made used parts can affect not only the comfort of operation but also the subsequent valuation of the vehicle upon resale. You can find more on this topic in the article Original used parts and car resale value – how not to lose?.

Expanding the repair with other Audi lighting elements

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 tail light assemblies, additional light modules, or bulb holders for the opposite side, check out the available parts in the Audi rear lights and brake lights category.