Mercedes W166 Rear Lamp Tail Light Outer Left N/S Side Lamp A1669065702

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W166 Rear Lamp Tail Light Outer Left N/S Side Lamp 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 proper light signaling while maintaining the factory styling line and compatibility with the vehicle's electrical system.

Specifications and technical data

• SKU: A1669065702
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1669065702
• Substitutable numbers: A1669065702, A 166 906 57 02
• Location on the vehicle: Rear, Left
• Category: Rear Light Assemblies

Purpose and fitment for Mercedes W166

The described outer rear lamp has been designed specifically for the W166 series body, taking into account the geometry of the fender, tailgate, and factory mounting points. The placement on the left side of the vehicle allows for direct replacement of a damaged component without the need for bodywork or wiring harness modifications.

By maintaining the original design of the optics and lens, the lamp supports proper dispersion of the position and brake lights, which translates into clear signaling for other road users and compliance with the manufacturer's factory specifications.

Construction and function in the rear lighting system

The element serves as the outer part of the rear lighting assembly on the left side, working in conjunction with the other lamps on the vehicle. The design provides:

• precise fitment to the body line in the rear fender zone,
• properly shaped optics for position and brake lights,
• maintenance of consistent color and light intensity relative to the right side.

Such a solution allows for maintaining uniform visibility of the vehicle from the rear, which is important for both safety and the aesthetics of the entire rear part of the body.

Characteristics of the used component

As a used part, the lamp comes from disassembly and represents a cost-effective solution for users who want to restore full lighting efficiency while maintaining the original origin of the component. This type of element is particularly attractive for post-accident repairs or replacing a single lamp when visual consistency with other body parts is desired.

Using an original rear lamp reduces the risk of problems with fitment, leaks, or incorrect light operation, which are typical for some lower-quality replacements.

Practical application and benefits of installation

Installation of this rear lamp on the left side of a Mercedes W166 is particularly recommended in situations where the existing element has suffered mechanical damage, lens cracking, or optical degradation. Replacing it with an original component allows you to:

• restore full functionality of position and brake lights,
• maintain the factory look of the rear of the vehicle,
• ensure compliance with lighting regulation requirements.

For workshops and individual users, this means simpler part selection, predictable installation, and reduced time required for fitting the element.

Related products and technical knowledge

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

When performing service work on the vehicle, it is also worth taking care of other safety systems. If you are interested in how to responsibly choose used components critical for safety, such as brake system elements, check out the guide Second-hand brake system: how to safely choose discs, calipers, and ABS?, which contains a practical checklist also useful when purchasing other used parts.