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

Mercedes W221 Rear Left Keyless Door Lock Actuator is an original part from the Internal Locks and Latches group, designed for the rear left area of the body. Thanks to its design adapted for the keyless system, it ensures precise cooperation with the vehicle's electronics and stable door closing, which translates into safe and comfortable car usage.

Specifications and technical data

• SKU: A2217300735-2
• 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: Interior Locks & Lock Hardware

Lock Purpose and Function

The presented lock actuator is dedicated for installation in the rear left part of the Mercedes W221 body, where it is responsible for mechanical locking and cooperation with the keyless access system. The component integrates the door locking function with electronically controlled sensors and actuators, enabling smooth opening and closing of the doors via the remote control or the comfort access system.

Thanks to its original origin from the Mercedes group, the lock actuator retains the correct mounting points, geometry, and operating characteristics, minimizing the risk of play, creaks, or improper door wing closing.

Construction and Keyless System Integration

The keyless rear left door lock actuator is designed to work with the factory comfort access system, which includes control modules, electrical wiring, and handle sensors. In practice, this means:

• maintaining full locking and unlocking functionality from the keyless system,
• correct communication with the body electronics,
• appropriately selected operating force of the locking mechanism.

Such a match helps avoid problems typical of aftermarket parts, such as errors in the comfort module, unreliable closing, or delayed response to the remote signal.

Benefits of Using an Original Lock Actuator

Using the original rear left door lock actuator in a Mercedes W221 offers a range of practical operational benefits:

• Factory Fitment – compatibility with the door and body structure, without the need for mounting modifications.
• Stable Electronic Operation – correct cooperation with the keyless system and central locking system.
• Noise Reduction – proper locking reduces the risk of knocks and play within the door wing.
• Consistency with Other Locking System Components – maintaining uniform operating characteristics of all locks in the vehicle.

The part comes from the Internal Locks and Latches segment, meaning it is designed for durable operation in demanding conditions typical of everyday vehicle use.

Condition and Service Application

The offered lock actuator is a used part, which means it comes from a dismantled vehicle and can be a cost-effective solution for service repairs. Replacing the lock actuator is particularly recommended in situations where there are problems with door closing, irregular central locking operation, or disruptions to the keyless system on the rear left side.

The correct lock actuator for a specific vehicle configuration is facilitated by dedicated manufacturer markings and associated replacement numbers, allowing for precise part matching to a given car model.

Expanding the Locking System in a Mercedes

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

To better plan service work and reduce vehicle downtime at the workshop, it is worth familiarizing yourself with practical tips on using a wide range of used parts – find more information in the article No More Weeks of Waiting – How a Wide Range of Parts in One Warehouse Can Actually Reduce Your Car's Downtime at the Mechanic?.