Door Lock Mercedes W221 S221 Rear Left N/S Latch Mechanism Actuator A2217307935

Mercedes W221 Rear Left Door Lock is an original part from the Locks and Latches group, designed for the rear left side of the body. It ensures proper locking, unlocking, and stable door closure, which translates to safe vehicle use and correct integration with the factory electrical system. Thanks to its factory design, it is a particularly beneficial solution for repairs after a collision or failure of the locking mechanism.

Specifications and technical data

• SKU: A2217307935
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2217307935
• Substitutable numbers: A2217307935, A 221 730 79 35, KD
• Location on the vehicle: Rear, Left
• Category: Exterior Locks & Lock Hardware

Intended Use and Vehicle Placement

The presented lock is dedicated for installation in the rear area, on the left side, which guarantees proper fit to the door structure and guides in W221 series models. Correct placement on the vehicle minimizes the risk of problems with the door wing geometry, and also facilitates integration with factory linkages and the electrical harness.

By maintaining the original mechanism geometry, the lock works with factory handles, linkages, and central locking actuators, which allows for consistent operation of the entire locking system in the vehicle.

Technical and Functional Characteristics

As a part of the Locks and Latches group, the door lock is responsible for several key operational functions:

• mechanical locking and unlocking of the rear left door,
• stable holding of the door in the closed position while driving,
• cooperation with the central locking system and remote control,
• correct transfer of movement from external and internal handles.

The original design of the lock promotes the preservation of factory door handling comfort – the force required to open and close remains predictable, and the mechanism's operation is consistent with other locks in the vehicle. This is particularly important in repairs where maintaining uniform operation of all locking points is desired.

Benefits of Using an Original Mercedes Lock

Using an original rear left lock in a Mercedes W221 helps to reduce the risk of problems typical of aftermarket parts, such as imprecise fit or unstable mechanism operation. The part has been designed for a specific body platform, which translates to:

• precise fit to the door and pillar structure,
• correct cooperation with the factory central locking system,
• preservation of the original functionality of the passive safety system,
• reduction of the need for additional installation modifications.

A used product offers a reasonable compromise between repair cost and maintaining original quality of workmanship. For many users, it is a practical solution for restoring full door functionality after mechanical damage or wear and tear.

Professional Use in Service and Repairs

The rear left door lock for the Mercedes W221 is suitable for both professional service centers and workshops specializing in the Mercedes brand. Thanks to its factory design, it facilitates plug-and-play repairs, reducing installation time and minimizing the risk of complaints related to incorrect operation of the locking mechanism.

In workshop practice, the repeatability of operation and compatibility with the existing vehicle installation are particularly appreciated, allowing focus on correct installation without the need for modifications to harnesses or mounting elements. This is a beneficial solution for both mechanics and end-users who value stable operation of the locking system.

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

For users interested in a broader approach to the operation and repair of systems in modern cars, including components responsible for exhaust emissions, an article describing the principle of operation of the exhaust gas recirculation system and the benefits of using used components may be helpful – you can find it here: EGR: what it is and why consider used EGR valves.