Mercedes W221 Window Lifter Motor Door Rear Left N/S Drive Unit A2218202942

The Mercedes W221 Window Regulator Motor Left Rear is a component from the Window Regulators and Motors category, designed for the rear left window in luxury Mercedes S-Class W221 sedans. This used motor ensures a factory fit, maintaining the correct operating geometry of the window lifting mechanism and stable integration with the vehicle's electrical system.

Specifications and technical data

• SKU: A2218202942
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2218202942
• Substitutable numbers: A2218202942, A 221 820 29 42, KD
• Location on the vehicle: Rear, Left
• Category: Window Motors & Regulators

Vehicle Application and Placement

The presented window regulator motor is intended for installation in the rear left side of the body. It is responsible for powering the window's lifting and lowering mechanism, working in conjunction with the factory comfort control system in the Mercedes W221. Precise placement on the vehicle minimizes the risk of incorrect part selection and simplifies service planning.

Technical and Functional Characteristics

The motor operates within the electric window regulator system, ensuring smooth window movement within the guides. The design, as intended by the vehicle manufacturer, allows for:

• stable integration with the factory comfort control module,
• torque appropriately matched to the weight of the window and mechanism,
• maintaining the correct window speed without jerking,
• compatibility with the original door wiring harness.

By utilizing an original Mercedes solution, the motor retains the performance parameters intended for the S-Class, which is crucial for both passenger comfort and the longevity of the entire window lifting system.

Category: Mercedes Window Regulators and Motors

This component belongs to the specialized category of Window Regulators and Motors, which includes parts responsible for controlling car windows. Choosing parts from this group dedicated to Mercedes helps maintain the vehicle's structural integrity and reduces issues with connector, mounting, and electrical parameter compatibility.

If you need other components from the Window Regulators and Motors category for this brand, check our offer for Mercedes Window Regulators and Motors to select suitable parts for other doors or models.

Product Condition and Service Application

The offered motor is used, making it a practical solution for operational repairs where maintaining the original construction at a reasonable service cost is a priority. This type of part is particularly suitable in situations where:

• the existing window drive has worn out or been damaged,
• there are problems with the window stopping halfway,
• the regulator motor responds erratically or stops working under load.

Using an original window regulator motor in a Mercedes W221 helps reduce the risk of additional electrical system modifications and ensures predictable window system behavior after the repair is completed.

Technical Support and Service Knowledge

When planning repairs for the window system, it's advisable to consider the overall condition of the vehicle and other components prone to wear. Helpful resources may include guides on common failures and service costs for popular models. For example, the article Faulty BMW E90 Motors: Find Out What Can Ruin Your Budget! illustrates how analyzing structural weak points helps in better planning vehicle maintenance expenses.

If you want a broader perspective on car operation and the most frequently replaced parts, consult the guide TOP 10 Most Frequently Replaced Parts in Your Car, which facilitates a conscious approach to planning inspections and repairs.