Mercedes W203 Rear Left Door Lock Latch Mechanism Actuator A2037300135

Mercedes W203 Rear Left Door Lock Latch Mechanism Actuator is an original component from the Locks and Latches group, designed for the rear left body section. It enables the proper operation of the door locking and unlocking mechanism, ensuring stable latching and compatibility with factory Mercedes vehicle systems. This is a practical solution for users who want to restore full door functionality without interfering with the body structure.

Specifications and technical data

• SKU: A2037300135
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2037300135
• Substitutable numbers: A2037300135, A 203 730 01 35
• Location on the vehicle: Rear, Left
• Category: Exterior Locks & Lock Hardware

Purpose and function of the door lock

The presented lock is dedicated to the rear left side of the body in W203 series models, allowing for precise fitment to factory mounting points. The component is responsible for the mechanical latching of the door leaf, interaction with the door handle, and transferring movement from the opening mechanism. As a result, the door remains securely closed while driving, and its unlocking is performed in a controlled manner.

Placement in the rear part of the vehicle means that the lock operates in an area particularly exposed to frequent opening and closing cycles, which is why the proper selection of the component is important for passenger comfort and the durability of the entire door system.

Construction and body fitment

The lock has been designed as a component structurally compliant with Mercedes factory standards, which facilitates installation in the original mounting holes. The construction intended for operation in the rear left part of the body ensures proper alignment of the latch relative to the pillar and striker, minimizing the risk of play or improper closing.

The appropriate shaping of the housing and the arrangement of mounting points allow for maintaining the correct door geometry, which translates into even sealing and the reduction of unwanted noises while driving. A well-chosen lock also supports the stable operation of the door handle mechanism and any associated control systems.

Benefits of using an original lock

Using an original lock in the rear left part of the body allows for maintaining the structural integrity of the vehicle. The main advantages of such a solution include:

• maintaining the factory method of door locking and interaction with other system components,
• proper fitment to the geometry of the door leaf and the body pillar,
• reducing the risk of problems with closing, rebounding, or jamming of the mechanism,
• possibility of installation without the need for structural modifications.

For users who value the consistency of technical solutions in their vehicle, the original Mercedes door lock is a sensible choice for repairs in the rear left part of the body.

Component condition and service application

The offered lock comes from the secondary market, which allows for an economical restoration of the door system's efficiency while maintaining compliance with the factory design. This type of component is particularly useful in situations where the latching mechanism has worn out, been damaged during a collision, or there are problems with the proper closing of the door leaf.

Replacing the lock in the rear left part of the body is a typical service procedure performed to eliminate play, improper latching, or excessive resistance when opening. Using a component compatible with the W203 design facilitates workshop work and shortens installation time.

If you are planning a comprehensive repair or modernization of the rear left door area in your Mercedes and need other elements from the same group, such as latching mechanisms, lock cylinders, or additional mounting elements, check the available parts in the Mercedes Locks and Latches category.

For drivers interested in a broader perspective on the operation and selection of used vehicle system components, an article describing the operation of exhaust gas recirculation systems and the advantages of using secondary market components may be helpful – more information can be found in the material EGR: what it is and why it is worth considering used EGR valves.