Mercedes W166 Door Sill Rear Left N/S Trim Entrance Cover Step Plate A1666860036

Mercedes W166 Door Sill Rear Left N/S Trim Entrance Cover Step Plate is an original cabin entrance cover designed for installation on the rear left door edge. This component from the Doors and door panels category provides an aesthetic finish to the sill area and additional protection for the paintwork against mechanical damage. Thanks to its factory-fit design, it is a practical solution for body repairs and refreshing the interior of this premium SUV.

Specifications and technical data

• SKU: A1666860036
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666860036
• Substitutable numbers: A1666860036, A 166 686 00 36
• Location on the vehicle: Rear, Left
• Category: Doors & Door Skins

Purpose and vehicle placement

The described door sill trim is designed for installation in the rear part of the body on the left side, in the entrance area to the second row of seats. The precise fit to the sill geometry in the Mercedes W166 allows for stable seating of the component in factory mounting points, without the need for modifications or forced fitting.

This placement means the trim operates in an area particularly exposed to scratches from footwear and minor impacts during entry and exit. The use of a dedicated cover reduces the risk of paint damage and helps keep the sills in good visual condition.

Technical and functional characteristics

The Mercedes W166 Door Sill Rear Left N/S Trim Entrance Cover Step Plate has been developed as a body component that serves both protective and finishing functions. The construction is optimized for:

• precise fitment with the sill edge and the lower part of the door frame,
• resistance to typical operational loads in the entrance area,
• easy removal and reinstallation during service work.

Thanks to its factory design, the trim works in harmony with other door finish elements, creating a visually and functionally cohesive system. The properly contoured surface facilitates cleaning and limits the accumulation of dirt in critical areas.

Condition, origin, and benefits of use

The component comes from the Mercedes range, which ensures the preservation of original geometry, material quality, and compatibility with factory mounting points. As a used part, it is a cost-effective solution for post-accident repairs, replacing damaged covers, or restoring the interior aesthetics of older W166 models.

Using an original door sill trim allows you to:

• maintain a consistent look of the door area with other body components,
• preserve the proper fit of seals and linings,
• minimize the risk of improper installation typical of aftermarket parts with poorer fitment.

Application in vehicle restoration and modernization

The rear left door sill trim is suitable both for standard repairs following mechanical damage and for projects refreshing the interior of a premium SUV. Replacing worn or scratched sill covers significantly improves the visual perception of the cabin, especially in vehicles that are heavily used.

If you are planning a comprehensive repair or modernization of the door area in your Mercedes and need other components from the same group, such as panels, reinforcements, or additional covers, check the available parts in the Mercedes Doors and door panels category.

When planning a broader body or interior restoration, it is also worth reaching for practical knowledge regarding working with used components – you will find it in the article Second life of a youngtimer – how used car parts rejuvenate cars from the 1998–2012 model years, which discusses, among other things, modernization scenarios for Mercedes models using original dismantled parts.