Mercedes W221 Door Lock Latch Mechanism Actuator Front Left N/S A2217208135

Mercedes W221 Door Lock Latch Mechanism Actuator Front Left N/S is a factory-original locking mechanism with a built-in actuator, designed for installation on the passenger side in right-hand drive (RHD) versions. This precision component from the Locks and Latches category is responsible for secure closing, unlocking, and seamless integration with the central locking system and body electronics.

Specifications and technical data

• SKU: RHD-A2217208135-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2217208135
• Substitutable numbers: A2217208135, A 221 720 81 35
• Location on the vehicle: Front, Left
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock mechanism is dedicated to the front left door of the Mercedes S-Class W221 body, in a right-hand drive configuration. Positioned in the passenger door area, this component is responsible for:

• mechanical locking and unlocking of the door leaf,
• transferring drive from the central locking actuator to the latch mechanics,
• cooperation with external and internal door handles,
• stable retention of the door in the closed position while driving.

Thanks to its factory design, the lock maintains proper operating geometry, which translates into smooth handle operation and correct interaction with the vehicle's electrical system.

Mechanism construction and OEM advantages

The Mercedes W221 Door Lock Latch Mechanism Actuator combines the mechanical part and the actuator in a single housing. Using the original design ensures:

• precise fit to the door panel and factory mounting holes,
• proper cooperation with the rods and handles intended for this model,
• compliance with central locking and comfort control operating parameters,
• adequate body rigidity, reducing play and noise while driving.

The original lock from this series is designed for long-term operation in luxury class vehicles, which promotes stable operation of the locking system even with intensive use.

Condition, fitment, and installation

The offered item is in used condition, allowing for an economical replacement while maintaining factory specifications. The mechanism is intended for direct installation in the appropriate body variant, preserving the original routing of screws, clips, and rods.

When replacing, it is recommended to:

• check the correct adjustment of the handle rods,
• verify the operation of the central locking after installation,
• inspect the tightness and positioning of seals in the door area.

This approach facilitates the restoration of proper door opening and closing comfort without additional body adjustments.

Benefits of using an original Mercedes lock

Using a factory door lock in a Mercedes W221 allows for maintaining the consistency of the entire comfort system. In practice, this means:

• maintaining factory central locking operating parameters,
• correct cooperation with body electronics and comfort functions,
• reducing the risk of the door not closing or opening spontaneously,
• easier diagnostics in case of any future faults.

For the user, this translates into consistent operation of the locking system and predictable vehicle behavior in daily operation.

If you are planning a comprehensive repair or upgrade of the door lock area in your Mercedes and need other components from the same group, such as locking mechanisms, actuators, or cylinders, check out the available parts in the Mercedes Locks and Latches category.

For drivers interested in a broader look at automotive design development, upgrades, and the selection of used parts, an article describing the evolution of a popular hot-hatch may be helpful – Hot-hatch legend: the evolution of the VW Golf GTI from Mk1 to Mk8 – design changes and VW car parts.