Mercedes W166 Door Sill Step Plate Rear Right O/S Entrance Cover A1666800635

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W166 Door Sill Step Plate Rear Right O/S Entrance Cover is an original body component from the Doors and door panels group, designed for installation in the rear right sill area. This used door sill plate allows for maintaining the factory body geometry, ensures a consistent appearance of the vehicle's side, and provides functional protection for the sill against mechanical damage.

Specifications and technical data

• SKU: A1666800635
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666800635
• Substitutable numbers: A1666800635, A 166 680 06 35
• Location on the vehicle: Rear, Right
• Category: Doors & Door Skins

Purpose and function of the component

The rear right door sill cover in the Mercedes W166 class operates in a critical area of the body, where the sill is exposed to scratches, dirt, and minor impacts when entering and exiting the vehicle. This component:

• protects the sill edge and the lower part of the door opening from operational damage,
• visually stabilizes the side line of the body,
• helps reduce corrosion in the sill area by covering the door sheet metal.

Thanks to its original design, the plate works with factory mounts and the shape of the panel, which facilitates installation and ensures proper fitment with the doors and adjacent body parts.

Construction and body fitment

The door sill plate has been designed specifically for the W166 platform, taking into account the characteristic geometry of the rear body section on the right side. The properly profiled working surface allows for:

• precise adhesion to the sill and door panels without stress,
• maintaining a mounting gap consistent with the manufacturer's standard,
• proper interaction with seals and interior linings.

The original Mercedes origin means dimensional compatibility with the factory design, which minimizes the risk of installation problems and eliminates the need for modifications or adjustments to the component on the vehicle.

Installation zone: rear – right side

The placement on the vehicle in the rear right sill area requires the use of a dedicated component with the correct profile. This plate is designed specifically for this position, thanks to which it:

• ensures a consistent sill line flow between the wheel arch and the rear door edge,
• does not interfere with chassis cover mounts or suspension components in this area,
• maintains the aesthetic appearance of the side of the body on the passenger side.

Such fitment is important both visually and functionally – a correctly selected sill cover limits the accumulation of dirt and moisture around the door edge.

Characteristics of the used component

The presented door sill plate is a used component, which in practice means a real cost benefit while maintaining the manufacturer's original specification. For many Mercedes W166 users, this is a reasonable solution for:

• post-accident repairs in the area of the sills and rear doors,
• local body renovations after corrosion or mechanical damage,
• restoring the vehicle to a state close to factory condition after previous non-factory modifications.

Using an original, used plate allows for maintaining material and structural consistency with other body components, which is important both from the point of view of durability and the subsequent resale of the vehicle.

Integration with other body components

The rear right door sill cover works with the doors, side panels, and interior sill linings. With proper installation:

• it does not interfere with the operation of the rear door locks and hinges,
• it maintains the continuity of the sill line in combination with other covers,
• it allows for maintaining the factory character of the entrance area finish for rear seat passengers.

Thanks to this, the component is an important addition to body and paint work in the side body area, especially when you want to maintain the original look of the vehicle.

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

For users interested in a conscious approach to vehicle operation and the use of recycled parts to reduce environmental impact, the information contained in the article Eco-tuning in practice: how to increase performance while reducing your carbon footprint with recycled parts may be useful.