Mercedes W166 Door Sill Step Plate Rear Left N/S Entrance Cover Trim A1666800535

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W166 Door Sill Step Plate Rear Left N/S Entrance Cover Trim is an original body component from the Doors and door panels category, designed for installation in the rear left section of the vehicle. It provides an aesthetic finish to the cabin entry area and additional protection for the door sill against mechanical damage and dirt. It is a practical solution for users who want to maintain a consistent body appearance and correct door sill geometry.

Specifications and technical data

• SKU: A1666800535
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666800535
• Substitutable numbers: A1666800535, A 166 680 05 35
• Location on the vehicle: Rear, Left
• Category: Doors & Door Skins

Purpose and function of the door sill component

The rear left door sill trim in W166 series models is responsible for covering the metal part of the sill and the lower edge of the door opening. A properly selected cover:

• visually stabilizes the side line of the body,
• reduces the risk of scratches when entering and exiting the vehicle,
• makes it easier to keep the door sill area clean,
• supports proper drainage of water and debris from the door area.

Thanks to its dedicated placement on the rear left side of the vehicle, the component is structurally matched to the body geometry, which translates into secure mounting and proper fitment with other door panels.

Original origin and fitment for Mercedes W166

The trim was designed specifically for Mercedes vehicles from the W166 family, which means it adheres to factory dimensional and assembly standards. The original construction ensures:

• compatibility with factory mounting points in the door sill area,
• consistency of the styling line with other door and body elements,
• easier installation without the need for modifications or adjustments required by aftermarket replacements.

Using an original door sill cover allows for maintaining a uniform finish standard, which is important both from an aesthetic point of view and for the future resale of the vehicle.

Performance characteristics and installation

The component from the Doors and door panels category is structurally prepared to work in demanding operating conditions typical for the door sill area. The rear left door sill cover:

• works in direct contact with users' footwear,
• is exposed to moisture, mud, and minor impacts,
• must maintain dimensional stability in varying temperatures.

Selecting the correct component for the rear left side of the vehicle reduces the risk of leaks, improper fit, or stress on adjacent body panels. Installation follows the factory service procedure, which facilitates workshop work and shortens repair time.

Condition, benefits of using a used part, and economic aspects

The offered door sill trim is used, which represents a favorable compromise between quality and repair cost. Choosing an original salvaged component allows you to:

• maintain factory fitment and body geometry,
• reduce replacement costs compared to a new part,
• limit the risk of installation problems typical of some aftermarket replacements.

For users planning broader body and paint work in the area of the sills and doors, using original used components is often an optimal solution in terms of both technical and budgetary aspects. If you want to learn more about the advantages of using proven salvaged parts in vehicle systems, it is worth reading the article Brake calipers under the microscope: How to effectively reduce brake system repair costs by choosing proven salvaged parts, which discusses the practical aspects of such an approach.

Expanding work in the Mercedes door sill area

If you are planning a comprehensive repair or upgrade of the door sill area in your Mercedes and need other elements from the same group, such as covers, overlays, or additional trims, check out the available parts in the Mercedes Doors and door panels category.

Summary of the rear left door sill trim application

Mercedes W166 Door Sill Step Plate Rear Left N/S Entrance Cover Trim is a practical, factory-fitted body component that restores the correct appearance and functionality of the rear cabin entry area. Using an original, used trim allows for a technically correct repair while maintaining reasonable costs, and simultaneously supports the maintenance of a consistent side line styling of the vehicle.