Mercedes W221 Door Lock Rear Left N/S Actuator Catch Keyless A2217300735

Description

Mercedes W221 Door Lock Rear Left N/S Actuator Catch Keyless is an original component from the Locks and latches category, designed for installation on the rear left side of the vehicle body. It ensures the proper operation of the locking mechanism, compatibility with the keyless system, and stable door closing, which translates into comfort in everyday vehicle use.

Specifications and technical data

• SKU: A2217300735
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2217300735
• Substitutable numbers: A2217300735, A 221 730 07 35
• Location on the vehicle: Rear, Left
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock is dedicated to the rear left part of the body in the Mercedes S-Class W221 generation model. It is responsible for the mechanical locking of the door, cooperation with the central locking actuator, and support for the keyless system, which allows for convenient opening and closing of the vehicle without the use of a traditional key.

Thanks to its factory design, the component maintains the correct geometry of mounts and attachment points, which facilitates installation and allows for the preservation of the original door seal and acoustics. This is particularly important in premium class cars, where both acoustic comfort and the precision of all components are essential.

Construction and cooperation with the keyless system

The lock combines a mechanical part and an actuator responsible for operation with the central locking and keyless system in one housing. This solution allows for:

• consistent operation of the internal and external handle mechanism,
• smooth locking and unlocking of the door via the remote control or keyless system,
• maintaining communication with the vehicle’s electronics in accordance with factory specifications.

The original design ensures appropriate durability of moving parts and compatibility with factory electrical harnesses, which reduces the risk of fitment issues or the need for installation modifications.

Condition, origin, and benefits of choosing a used part

The element comes from dismantling and is offered as a used Mercedes part, which is a reasonable compromise between cost and maintaining original quality. Unlike replacements with uncertain parameters, the factory lock maintains compatibility with the door structure, electronics, and the vehicle’s safety system.

Choosing an original lock from the secondary market allows you to:

• maintain the consistency of the central locking and keyless system operation,
• preserve the factory fit for the rear left door,
• reduce repair costs while maintaining high manufacturing quality.

If you are considering whether regeneration or installing a used part from dismantling is a better solution, it is worth reading our guide: Refurbished or used original – which part to choose for repairs?.

Selection and installation of the rear left door lock

To ensure proper operation, the lock should be selected exclusively for the W221 body and installed exactly in the rear left position. This ensures correct cooperation with handles, guides, seals, and control modules in the door.

During installation, it is worth paying attention to:

• correct positioning of rods and cables in the door,
• secure connection of electrical connectors,
• checking the operation of the central locking and keyless system after reassembling the upholstery.

This approach minimizes the risk of having to remove the door panel again and allows for quick verification of the mechanism’s full functionality.

Expanding the scope of repair – Mercedes Locks and latches

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

Summary

Mercedes W221 Door Lock Rear Left N/S Actuator Catch Keyless is a practical solution for users looking for an original, fully compatible component from the locks and latches group. Thanks to its factory design, dedicated placement on the vehicle, and integration with the keyless system, the part allows for restoring the proper operation of the door and central locking, while maintaining the comfort of use characteristic of this class of vehicle.