Mercedes ML W166 Sealing Rail Strip Rear Door Right O/S A1667356600

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes ML W166 Sealing Rail Strip Rear Door Right O/S is an original body component from the Window seals and strips group, designed for installation in the rear right door area. It ensures a tight seal between the door waist rail, the window, and the door panel, improving protection against water, noise, and dirt, while maintaining the factory body line characteristic of Mercedes models.

Specifications and technical data

• SKU: A1667356600
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667356600
• Substitutable numbers: A1667356600, A 166 735 66 00
• Location on the vehicle: Rear, Right
• Category: Window Seals, Gaskets & Trims

Purpose and function of the component

The rear right door sealing rail is responsible for the precise sealing of the contact point between the window and the door edge in the premium SUV that is the Mercedes ML W166 generation. Its placement in the rear right door area means the component operates under demanding conditions – it is exposed to temperature fluctuations, moisture, and body vibrations, which is why choosing the correct original rail is important for acoustic comfort and interior protection.

The properly fitted geometry of the rail limits water ingress into the door interior, supports proper moisture drainage, and stabilizes the window edge during opening and closing. As a result, the window and seal system maintains proper operation, and the risk of window fogging and accelerated corrosion of the door edge is reduced.

Benefits of using an original Mercedes rail

Using an original component from the Window seals and strips group instead of a worn or damaged part offers a number of practical benefits:

• factory fitment to the shape of the door and window in the Mercedes ML W166,
• stable guidance of the window edge in the rear right part of the body,
• maintenance of a consistent stylistic line of the vehicle's side,
• reduction of air drafts and noise at higher speeds,
• better protection against water and dirt ingress into the door interior.

Thanks to the preservation of the original mounting design, the rail allows for service at a standard close to the factory one, without the need for modifications or fitting replacements with uncertain geometry.

Characteristics and condition of the component

The offered rail is a Mercedes brand component, which means it complies with the factory design assumptions for ML W166 models. The item is in used condition, which in practice means it comes from dismantling and may show signs of wear typical of parts mounted in a vehicle, while maintaining the functionality required for further use.

The placement on the vehicle in the rear right part of the body requires maintaining appropriate material stiffness and flexibility so that the rail works correctly with the window mechanism and other seals. Proper fitment in this area affects the comfort of using the door, the operating smoothness of the windows, and the overall tightness of the passenger cabin.

Selection and application in service practice

When selecting a rear right door sealing rail for a Mercedes ML W166, it is crucial to rely on vehicle identification data and part numbers assigned to a specific body configuration. This allows avoiding assembly problems and ensures the correct adhesion of the component to the window and door panel.

In service practice, replacing the rail is recommended in situations where:

• cracks, deformations, or material losses are visible,
• leaks appear, resulting in water entering the door interior,
• unusual air noises occur in the area of the rear right window,
• post-accident repair of the side of the body is necessary.

Replacing it with an original component allows for the restoration of factory seal operating parameters and reduces the risk of secondary faults related to moisture in the doors, such as accelerated corrosion or problems with the electrical installation in this area.

Expanding the scope of service work

If you are planning a comprehensive repair or upgrade of the side glazing area in your Mercedes and need other elements from the same group, such as window seals, trim strips, or additional sealing profiles, check the available parts in the Mercedes window seals and strips category.

When working on the tightness and operating culture of the power unit in diesel-engined cars, it is also worth paying attention to the condition of the fuel system. More information about the symptoms and consequences of neglect in this area can be found in the article Diesel injector faults – how to recognize them and what are the risks of ignoring them.