Mercedes W203 Door Lock Rear Left N/S Latch Mechanism Actuator A2037300135

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W203 Door Lock Rear Left N/S Latch Mechanism Actuator is an original component from the Locks and latches group, designed for the rear left side of the vehicle body. This used lock ensures a factory-fit to the door structure, maintaining proper cooperation with the handle mechanism, rods, and the central locking electrical system.

Specifications and technical data

• SKU: A2037300135-1
• 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 vehicle, which guarantees the correct geometry of the mounts and the proper operation of the locking mechanism. The component is responsible for securely closing the door, working with the central locking system, and maintaining a stable position of the door panel while driving.

Thanks to a design consistent with factory solutions, the lock maintains appropriate rigidity, precision of the latch operation, and correct cooperation with the internal and external handle rods. This is particularly important for vehicles equipped with advanced comfort systems, where proper locking affects acoustic tightness and vibration reduction.

Benefits of using an original Mercedes lock

Using an original rear left lock for the Mercedes W203 allows for maintaining the structural integrity of the entire door system. The component has been designed for specific body geometry, which ensures that it:

• provides stable locking during repeated opening and closing of the door,
• reduces the risk of play and improper closing of the door panel,
• maintains compatibility with the factory central locking and electrical system,
• allows for installation without interfering with the door structure.

Choosing a used, original lock is a cost-effective solution that is also technically matched to the specific model. This allows for restoring full door functionality without the need to use replacements with uncertain manufacturing tolerances.

Condition, origin, and installation aspects

The offered lock comes from dismantling and is a used part, which allows for maintaining a reasonable cost level while preserving the factory specification. The design intended for installation in the rear left part of the body allows for mounting in the place of the original lock, using existing mounting points and factory connectors.

During installation, it is recommended to pay attention to the correct positioning of the rods, proper connection of the electrical harness, and adjustment of the lock position relative to the striker in the pillar, so that the door closes smoothly and without excessive force. A correctly installed lock affects the comfort of using the vehicle, reduces noise, and ensures the proper operation of the central locking.

Application in the safety and comfort system

The rear left door lock in the Mercedes W203 is an important element of the passive safety system – it is responsible for keeping the door in a closed position while driving and in emergency situations. At the same time, it cooperates with comfort systems, such as the central lock or any remote control functions, ensuring consistent operation of the entire system.

Thanks to the factory design, the lock maintains the appropriate operating characteristics of the mechanism, which translates into predictable handle operation, no jamming, and repeatable locking. This is particularly important in daily use, where the rear doors are regularly used by passengers.

Expansion of the Locks and latches system in Mercedes

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

New or used lock components – how to choose?

When selecting a door lock for a Mercedes, it is worth consciously comparing the advantages of new and used OEM parts, taking into account costs, durability, and fitment to the specific body version. A detailed discussion of the differences, examples of applications, and practical tips can be found in the article New or used? A comparison of costs and quality of car parts, which will help you choose the solution best suited to your vehicle.