Mercedes W204 W212 Rear Right O/S Window Regulator Lifter Motor Panel

Mercedes W204 W212 Rear Right O/S Window Regulator Lifter Motor Panel is an item from the Window regulators and motors category, designed for operating the rear right window in Mercedes vehicles. It enables stable window guidance and efficient power transmission from the lifting mechanism, ensuring comfortable and safe operation of the window opening system.

Specifications and technical data

• SKU: A2127301879
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2127301879
• Substitutable numbers: A2127301879, A 212 730 18 79, BG
• Location on the vehicle: Rear, Right
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The regulator is designed for installation in the rear right part of the body, within the passenger door. It is responsible for the precise guidance of the window in the tracks and for working with the electric or manual drive (depending on the vehicle configuration). A correctly selected component allows for the restoration of full window control functionality after a mechanism failure, seized tracks, or damage to the supporting structure.

Benefits of using an original regulator

Using a regulator dedicated to specific Mercedes W204 and W212 series models translates into:

• proper fitment with the door and factory mounting points,
• stable window guidance without excessive play or vibrations,
• smooth operation of the mechanism when opening and closing the window,
• reduced risk of recurring failure resulting from improper part fitment.

By maintaining geometry consistent with the manufacturer's design, the window system retains its tightness and proper seal contact, which is important for acoustic comfort and protecting the interior from moisture.

Installation characteristics

The window regulator is installed in the internal door structure, in the rear right zone. The design intended for a specific side of the vehicle facilitates installation and minimizes the need for additional modifications. In practice, this means:

• the ability to use factory mounting points,
• compatibility with the original window lift motor (if applicable),
• maintenance of the correct vertical range of window movement.

When replacing, it is recommended to check the condition of the tracks, seals, and window mounts to fully utilize the potential of the newly installed component.

Condition and service application

The item comes from the Window regulators and motors category and is intended for service applications in Mercedes vehicles where the window lifting mechanism on the rear right side has been damaged. This type of part is suitable both for standard repairs following operational wear and for restoring door functionality after a collision or bodywork intervention.

It is always worth confirming the selection of the regulator for a specific vehicle model based on the manufacturer's markings and body configuration, which helps avoid installation problems and ensures proper cooperation with existing door equipment.

Mercedes window regulators and motors – expansion and modernization

If you are planning a comprehensive repair or modernization of the door and side window area in your Mercedes and need other elements from the same group, such as window lifting mechanisms, control motors, or tracks, check the available parts in the Mercedes window regulators and motors category.

More about the cost-effectiveness of used components

When selecting used body and interior equipment elements, such as window regulators, it is worth knowing the differences between original parts, replacements, and aftermarket components. A detailed discussion of costs, quality, and matching by OEM numbers can be found in the guide Original, replacement, or used – which car parts are the most cost-effective?.

If you are simultaneously carrying out repairs within the drivetrain in your vehicle, the expert article on selecting mechanical components may also be helpful: Why it is worth buying used gearboxes and engines – facts instead of myths, which describes, among other things, verification procedures by OEM numbers and practical repair cost ratios.