Door Card Lamp Mercedes W166 W176 Courtesy Light A0028201901 Red

Visual condition of the part 

The product shows signs of use visible in the photos. 

Door Card Lamp Mercedes W166 W176 Courtesy Light is an original component from the Interior lighting group, designed specifically for Mercedes W166 and W176 class models. The red door card illumination improves the visibility of the door edge when opened, increasing safety and the clarity of the vehicle's interior in night-time conditions.

Specifications and technical data

• SKU: A0028201901
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0028201901
• Substitutable numbers: A0028201901, A 002 820 19 01
• Color: Red
• Category: Interior Light Assemblies

Purpose and function of the door lamp

The door card lamp in Mercedes W166 and W176 models serves both a signaling and functional role – the red beam of light informs other road users that the door is open, while simultaneously helping the driver and passengers with orientation when entering and exiting the vehicle. The component is structurally matched to the factory mounting holes in the door trim, ensuring stylistic consistency with other interior components.

This type of lighting is particularly important in conditions of limited visibility, on narrow streets, in underground parking lots, or when parked on the roadside. The red light color is easily recognizable and intuitively associated with a warning, which improves the clarity of the signal for other drivers.

Construction and performance parameters

The presented lamp belongs to the Interior lighting group but operates in the door area, where it is exposed to frequent opening and closing as well as temperature fluctuations. The housing is designed for stable seating in the door card, and the electrical connector is adapted for installation in the factory Mercedes wiring harness. The red lens used ensures uniform light diffusion and reduces glare.

As an original component, the lamp is compatible with the vehicle's electrical system, which minimizes the risk of installation errors and communication issues within the onboard network. This solution is particularly beneficial when servicing cars equipped with extensive lighting control systems.

Condition, installation, and service application

The product is a salvaged part intended for reinstallation in Mercedes W166 and W176 vehicles where the factory door card lamp has been damaged or worn out. This type of element is often replaced after side collisions, bodywork repairs, or during interior upgrades when the owner wants to restore full lighting functionality.

Installation typically involves unclipping the old module from the door trim, disconnecting the plug, and connecting the new lamp to the existing harness. Thanks to the factory fit, there is no need for wiring modifications or the use of additional adapters, which reduces service time and limits the risk of damaging the upholstery.

Benefits of using original interior lighting

Using an original door card lamp in a Mercedes allows for maintaining consistency in light color and intensity with other light points in the interior. This is important from both an ergonomic and aesthetic point of view – the interior looks uniform, and the lighting operates according to the manufacturer's specifications.

Additionally, during electrical system diagnostics, the service center can be certain that the component meets factory requirements, which facilitates the interpretation of potential errors and limits the need for additional measurements. Using original interior lighting components is especially recommended in vehicles equipped with advanced comfort and safety systems.

Expanding lighting upgrades in your Mercedes

If you are planning a comprehensive repair or upgrade of the door and interior area in your Mercedes and need other elements from the same group, such as dome lights, footwell lighting, or glove box illumination, check out the available parts in the Mercedes interior lighting category.

When planning work related to lighting, it is also worth familiarizing yourself with the principles of selecting and operating modern light sources in a car – you can find practical tips in the article See more and better – a complete guide to selecting and replacing used LED and Xenon headlights, which discusses the importance of proper lighting for driving safety.