Tailgate Position Sensor Mercedes W166 Boot Trunk Lid Right O/S A1668701051

Visual condition of the part 

The product shows signs of use visible in the photos. 

Tailgate Position Sensor Mercedes W166 Boot Trunk Lid Right O/S is a precision body system component responsible for accurately tracking the position of the right side of the tailgate in Mercedes vehicles. It enables stable communication with the vehicle's body electronics, ensuring the proper operation of functions related to opening, closing, and monitoring the tailgate position. As a factory-original component from the trim and finishing group, it is perfectly engineered to fit the vehicle body.

Specifications and technical data

• SKU: A1668701051
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1668701051
• Substitutable numbers: A1668701051, A 166 870 10 51
• Location on the vehicle: Right
• Category: Trim

Purpose and function of the tailgate position sensor

The right-side tailgate position sensor in W166 series models is responsible for transmitting information about the current tailgate setting to the control units. This is particularly important in vehicles equipped with advanced comfort systems, where the tailgate position affects the operation of power opening and closing mechanisms as well as instrument cluster alerts.

Its placement on the right side of the vehicle allows for precise monitoring of the tailgate movement in that area, which reduces the risk of reading errors and system malfunctions. Replacing a worn or damaged part with an original sensor dedicated to the W166 restores proper integration with the vehicle's body electrical system.

Construction and body fitment

The presented sensor belongs to the Claddings, decorative strips, and trims category, meaning it has been designed for proper integration with the structure and finish of the tailgate. The shape and mounting method are adapted to the factory mounting points on the W166 body, which facilitates installation and minimizes the need for additional modifications.

Proper alignment with the tailgate trim elements minimizes mechanical stress on the sensor during operation, which translates into stable readings and a longer service life for the entire system. As a result, the component maintains correct operating parameters even with frequent use of the tailgate.

Benefits of using an original Mercedes component

Using an original tailgate position sensor dedicated to the W166 series ensures:

• consistency with the vehicle's factory electrical and electronic system,
• proper fitment to the right-side tailgate structure,
• stable transmission of tailgate position information to the control units,
• reduction of the risk of system errors related to incorrect position readings.

This component is particularly recommended for post-collision repairs or when replacing damaged body parts, where it is necessary to restore full tailgate functionality without interfering with the original wiring harness.

Condition and practical application

The right-side tailgate position sensor is designed for installation in Mercedes W166 series vehicles where compliance with factory design solutions is required. As a body and trim component, it is suitable for both standard replacement of a faulty sensor and more extensive work related to the reconstruction of the rear of the vehicle.

Selecting the correct component for a specific vehicle allows you to avoid calibration issues and eliminates typical signs of wear, such as incorrect tailgate position readings or error messages in the comfort system. This is a practical solution for users who expect predictable tailgate system performance.

Expanding body work and technical knowledge

If you are planning a comprehensive repair or modernization of the rear body area of your Mercedes and need other elements from the same group, such as covers, overlays, or additional strips, check out the available parts in the Mercedes claddings, decorative strips, and trims category.

If you want to better plan your bodywork and finishing tasks and are considering installing used body parts, it is worth checking out our guide on how to select salvaged components so they maintain the right look and functionality – details can be found in the article Replacing body parts with used ones – can salvaged body parts look like new?.