Mercedes CL203 Bulb Holder Light Lamp Socket Rear Left Right N/O/S 151631-00

Mercedes CL203 Bulb Holder Light Lamp Socket Rear Left Right N/O/S is an original rear lighting system component designed for installation on either the left or right side of the vehicle. It ensures stable bulb seating, proper electrical connection, and safe operation of the rear lamps, which translates into clear signaling of maneuvers and better vehicle visibility on the road. This used, factory-original socket is an excellent choice for post-collision repairs, replacing a damaged socket, or restoring the lighting system to full functionality.

Specifications and technical data

• SKU: A2038200377
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2038200377
• Substitutable numbers: A2038200377, A 203 820 03 77
• Location on the vehicle: Rear, Right, Left
• Category: Light Bulbs & LEDs

Purpose and function in the lighting system

The rear bulb holder in Mercedes CL203 models is responsible for the mechanical and electrical connection between the bulb and the vehicle's wiring. This component works with the rear lamp, enabling the correct operation of position lights, brake lights, turn signals, or fog lights – depending on the specific lamp configuration.

Thanks to its precise fit to the lamp design and electrical harness, the socket helps maintain:

• stable bulb mounting in the rear lamp,
• reliable electrical contact between the bulb terminals and the wiring,
• proper positioning of the light source relative to the reflector and lens.

Vehicle placement and installation compatibility

The presented socket is designed for installation in the rear of the vehicle and can be used on both the left and right sides. This solution facilitates part selection during repairs – one type of socket can service both sides, provided the lamp design in the specific vehicle is compatible.

Its original Mercedes origin ensures the preservation of factory mounting points and geometry, which simplifies installation in place of the damaged component. In practice, this translates into:

• seamless fitment with the rear lamp,
• proper routing of wires and connectors,
• reduced risk of looseness, abrasion, and unstable contact.

Benefits of using an original socket

Using an original bulb holder in the rear lamp allows for maintaining lighting parameters consistent with the vehicle manufacturer's specifications. This is important for both safety and compliance with regulations regarding the efficiency of exterior lights.

Key advantages include:

• factory fitment to the electrical system – no need for modifications to the harness or connectors,
• preservation of the light distribution in the lamp as intended by the manufacturer,
• reduced risk of malfunctions resulting from overheating, looseness, or oxidation of contacts.

A used OEM component is particularly beneficial for maintenance repairs when the goal is to preserve the original lamp construction without investing in a complete new module.

Application in service practice

The rear bulb holder in the Mercedes CL203 is often replaced after mechanical damage to the lamp, socket overheating, or the appearance of intermittent lighting issues. Replacing the socket itself often allows avoiding the purchase of a complete lamp, which lowers repair costs while maintaining the correct operating parameters of the lighting system.

This component will prove effective both in professional service centers and independent workshops, where the ability to perform quick and repeatable repairs without experimenting with aftermarket parts of uncertain fit is valued.

If you are planning a comprehensive repair or upgrade of the rear lighting zone in your Mercedes and need other components from the same group, such as sockets, modules, or complete lamps, check out the available parts in the Mercedes Lamps and LED Lights category.

Safety and selection of used lighting components

When selecting used lighting components – such as sockets, lamps, or control modules – it is worth paying attention to the condition of the contacts, the absence of signs of overheating, and structural compatibility with the specific body version. A correctly selected rear bulb holder helps avoid common problems such as flickering lights, error messages on the dashboard, or uneven illumination.

More practical tips on selecting and replacing lighting components can be found in the guide See more and better – a complete guide to selecting and replacing used LED and Xenon headlights, which discusses key aspects of working with original lighting components.