Mercedes W203 Window Lifter Motor Rear Door Left N/S Regulator Drive A2038202942

Mercedes W203 Rear Left Window Motor is an original part of the window lifting system in the rear driver's side door, designed for Mercedes C-Class W203 models. As a component from the Window Regulators and Motors group, it ensures stable operation of the window mechanism and proper compatibility with the vehicle's electrical system. A used OEM part is a sensible choice for a professional repair or replacement of a damaged window drive.

Specifications and technical data

• SKU: A2038202942
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2038202942
• Substitutable numbers: A2038202942, A 203 820 29 42
• Location on the vehicle: Rear, Left
• Category: Window Motors & Regulators

Purpose and Vehicle Placement

The motor is designed for installation in the rear left part of the body, in the door behind the driver. It is responsible for driving the window lifting and lowering mechanism, working in conjunction with the original Mercedes W203 electric control system. This dedicated placement minimizes the risk of fitting issues and simplifies installation in place of the original component.

Technical and Functional Characteristics

As a component from the Window Regulators and Motors category, the motor is responsible for generating the torque needed for smooth window movement within the guides. The design intended by the vehicle manufacturer ensures:

• proper cooperation with the original window control system,
• correct rotation directions for "up/down" positions,
• stable operation under typical operating conditions,
• mechanical compatibility with the original door mounting points.

By maintaining the original geometry and mounting points, replacing a damaged drive with this model allows for the restoration of correct window operation without the need for modifications to the electrical system or door structure.

Application in Service and Repairs

The rear left window motor for the Mercedes W203 is suitable for both typical replacement of a damaged drive and more extensive service work on the rear doors. Choosing an original solution helps maintain the consistency of the electrical system and operating parameters in line with the manufacturer's specifications. This is a practical solution for workshops specializing in the Mercedes brand and for car owners performing their own maintenance.

Benefits of Using an Original Window Motor

Using a dedicated motor for the rear left window offers a number of operational benefits:

• preservation of original window control functionality,
• reduction of the risk of jams and uneven mechanism operation,
• reliable integration with the vehicle's electrical system,
• possibility of efficient replacement in workshop conditions.

For drivers who value technical consistency in their vehicle, choosing an original window drive is a way to maintain operating comfort and predictable system performance.

If you are planning a comprehensive repair or upgrade of the door and window area in your Mercedes and need other parts from the same group, such as window drives, lifting mechanisms, or control modules, check the available parts in the Mercedes Window Regulators and Motors category.

For drivers interested in the broader context of premium car operation and potential service costs, a guide article on problematic powertrains in a popular Bavarian brand model might be helpful – you can find it here: Troublesome BMW E90 Engines: Find Out What Can Ruin Your Budget!.