Pillar B Cover Mercedes ML W166 Interior Trim Top Right Black A1666900425

Visual condition of the part

The product shows signs of use visible in the photos.

Pillar B Cover Mercedes ML W166 Interior Trim Top Right Black is an original cabin trim component designed for the right side of the B-pillar in W166 series models. The black finish ensures a consistent match with the factory interior styling, while the OEM-compliant design guarantees proper fitment and stability. It is a practical solution for replacing damaged trim or completing the interior after bodywork and paint repairs.

Specifications and technical data

• SKU: A1666900425-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666900425
• Substitutable numbers: A1666900425, A 166 690 04 25
• Location on the vehicle: Right
• Color: Black
• Category: Trim

Purpose and function of the component

The described cover is the upper part of the B-pillar trim on the right side, mounted inside the vehicle cabin. It is responsible for aesthetically covering the pillar structure and maintaining the stylistic lines of the side interior. Thanks to its precise geometry, the component integrates seamlessly with adjacent upholstery panels, door seals, and the seat belt, creating a cohesive and visually organized area.

The black color scheme facilitates integration with most factory interior configurations, and the use of original mounting points allows for installation in place of the factory part without the need for modifications.

Design parameters and fitment

The B-pillar cover has been designed specifically for Mercedes W166 series vehicles, taking into account the dimensions and shape of the right side of the body. The profile of the element is matched to the door edge and roofline, which minimizes the risk of looseness, rattling, and unwanted vibrations while driving.

Precise fitment with factory mounting points facilitates service work – removing the old trim and installing this cover can be performed using standard upholstery service procedures, without additional adaptations. This is particularly important for post-accident repairs, interior restoration, or completing missing elements after previous interventions.

Color and interior aesthetics

The black shade of the cover allows for maintaining a consistent character of the cabin, both in configurations with dark upholstery and in contrasting combinations. The surface of the element has been designed to reduce the visibility of minor dirt and signs of wear, which translates into a more orderly appearance of the side interior.

Using an original cover instead of aftermarket replacements helps maintain a uniform texture and seam lines with other panels, which is important for maintaining the visual quality of the cabin, especially in premium vehicles.

Use in service and restoration

The component is suitable for situations where the factory B-pillar cover is mechanically damaged, scratched, deformed, or was removed during previous repairs. Replacing it with an original trim piece allows for restoring the correct appearance and functionality of this area without compromising on fitment.

During service work, it is worth paying attention to the correct routing of wiring, clips, and accompanying elements within the pillar area to fully utilize the cover's design and avoid unwanted noises during operation. This solution is particularly useful for workshops specializing in the Mercedes brand and for users independently completing the interior after repairs.

Condition and benefits of choosing a used part

The offered cover comes from the used parts group, which allows for an economical restoration of the interior's completeness while maintaining the manufacturer's original specifications. Choosing such an element is beneficial especially when the priority is compliance with the factory design and cost reduction compared to new components.

For many users and service centers, using a used B-pillar trim represents a reasonable compromise between quality and budget, while maintaining proper fitment and consistent cabin styling.

If you are planning a comprehensive repair or upgrade of the interior trim area in your Mercedes and need other elements from the same group, such as covers, moldings, or decorative panels, check the available parts in the Mercedes Upholstery, Decorative Moldings and Trim category.

For a better understanding of the specifics of solutions used in models of this brand and the selection of appropriate interior and body components, it is worth reading the article discussing the development of construction and parts in subsequent generations of the S-Class: Evolution of the Mercedes S-Class: from W140 to W222 – innovations, model differences, and Mercedes auto parts over the years.