Bulb Socket BMW E81 E87 LCI Rear Light Left N/S 0442637

Bulb Socket BMW E81 E87 LCI Rear Light Left N/S is an original lighting system component designed for installation in the rear left lamp assembly of facelifted BMW 1 Series models. This used OEM part ensures factory-fitment, correct electrical circuit routing, and stable bulb seating within the lamp. It is a practical solution for repairing a damaged or overheated socket in an original lamp.

Specifications and technical data

• SKU: 0442637
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 0442637
• Substitutable numbers: 0442637, 63210442637
• Location on the vehicle: Rear, Left
• Category: Centre & Third Brake Light Assemblies

Purpose and function in the lighting system

The presented bulb socket is a component of the Main and center brake lights system in the facelifted (LCI) BMW 1 Series E81/E87, mounted on the rear left side of the vehicle. It is responsible for:

• mechanically holding the bulbs in the correct position within the lamp,
• ensuring a stable electrical contact with the vehicle's wiring,
• proper operation of the brake light, position light, and other functions assigned to the left rear lamp.

Thanks to its design compliant with the BMW factory standard, the socket works with the original electrical harness and rear lamp without the need for any modifications.

Construction and fitment for BMW E81 E87 LCI

The element has been designed specifically for the rear left lamp in LCI versions, which means that the geometry of the mounts, electrical path routing, and bulb socket layout meet BMW's factory requirements. In practice, this translates into:

• secure seating in the lamp housing without play or stress,
• easy connection to the standard wiring harness plug,
• preservation of the original lighting characteristics and light distribution.

Such fitment is particularly important during post-collision repairs or lamp replacement, when maintaining consistency with other body components is essential.

Benefits of using an original bulb socket

Using an original socket in the BMW E81/E87 LCI helps to limit typical problems associated with aftermarket replacements, such as unstable contacts or imprecise mounting. Replacing a damaged component with an OEM part brings a number of practical benefits:

• restoration of full functionality of the rear lighting on the left side,
• reduction of the risk of lighting errors on the dashboard,
• maintenance of electrical system consistency with BMW service documentation,
• easier diagnostics in the future thanks to the preservation of the original system architecture.

For users who care about the technical correctness of repairs, this is a solution compliant with the vehicle's factory specification.

Part condition and service application

The bulb socket is a used item, which in practice means it comes from disassembly and can be an attractive cost-effective alternative to a new OEM part. Such components are commonly used in:

• post-accident rear lamp repairs,
• fixing faults resulting from overheating or contact corrosion,
• restoring lighting efficiency in fleet and private vehicles.

Choosing a used socket allows you to maintain original BMW quality while reducing service costs.

If you are planning a comprehensive repair or upgrade of the rear lighting zone in your BMW and need other elements from the same group, such as bulb holders, lamp modules, or complete light assemblies, check the available parts in the Main and center brake lights BMW category.

Additional information for BMW users

For drivers interested in a broader technical context and the differences between standard components and BMW sports versions, an article describing the specifics of M and M Performance components may be helpful – you can find it here: BMW M Performance: how do BMW M components differ from standard ones?.