Mercedes W166 Rear Door Arm Rest Window Lifter Switch Cover Left N/S A1667300128

The Mercedes W166 Rear Left Door Window Regulator Switch Cover is an original trim piece from the Door Upholstery group, designed for installation in the rear left passenger cabin area. Its grey color ensures consistency with the factory interior trim, and its design, tailored to a specific body generation, facilitates precise installation and maintains OEM aesthetics.

Specifications and technical data

• SKU: A1667300128
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667300128
• Substitutable numbers: A1667300128, A 166 730 01 28
• Location on the vehicle: Rear, Left
• Part type: Door Panel
• Color: Grey
• Category: Door Panels

Purpose and Function of the Component

The described switch cover is dedicated to the rear left door of W166 series models and is an integral part of the window control panel. It is responsible for aesthetically covering the window regulator button and ensuring its stable operation within the door upholstery. Thanks to its factory profile, the element precisely fills the mounting space, which reduces the risk of looseness, squeaking, or unwanted vibrations during driving.

Color Scheme and Visual Matching

The grey finish of the cover has been selected to harmonize with typical interior configurations in Mercedes W166 models. The neutral shade facilitates integration with other door components, such as side panels, handles, or decorative trims, ensuring that replacing a damaged part does not disrupt the cabin's stylistic coherence. This is a practical solution for post-accident repairs, spot renovations, or restoring the interior to a factory-like condition.

Installation Characteristics

The switch cover has been designed for a specific placement on the vehicle – the rear left side. This means that the geometry of the mounts, the shape of the edges, and the line of the pressings are adapted to the factory door panel in this part of the body. In practice, this translates to:

• easier fitting with existing door upholstery,
• correct positioning relative to the window regulator switch,
• maintaining operational ergonomics for rear-seat passengers.

This allows the component to be used both for replacing a damaged cover and for completing missing details after upholstery removal.

Condition and Application in Service

As a used part, the Mercedes W166 Rear Left Door Window Regulator Switch Cover is a sensible service solution for interior repairs where compliance with original specifications and cost control are important. This type of component is particularly useful in:

• repairs after mechanical damage to the door panel,
• completing missing elements after previous interventions,
• interior renovations where maintaining the factory character is a priority.

Choosing an original cover from the same model series reduces the risk of fitment issues typical of aftermarket parts with universal geometry.

Integration with Other Mercedes Upholstery Elements

If you are planning a comprehensive repair or upgrade of the door area in your Mercedes and need other elements from the same group, such as side panel liners, handle covers, or additional decorative inserts, check the available parts in the Mercedes Door Upholstery category.

For drivers interested in a broader perspective on the construction and operation of components related to comfort and operational ergonomics, an article discussing the principles of steering and power steering systems, along with examples of interior components related to vehicle operation, may be helpful – you can find it here: Steering and Power Steering Systems – How They Work and What Fails.