Mercedes W177 Rear Door Lock Actuator Mechanism Left N/S A0997302001

Mercedes W177 Rear Door Lock Actuator Mechanism Left N/S is an original component from the Internal locks and latches group, designed for the rear body section. This used OEM part ensures proper compatibility with the factory electrical installation, central locking system, and door mechanics, resulting in stable and predictable operation of the locking system.

Specifications and technical data

• SKU: A0997302001
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0997302001
• Substitutable numbers: A0997302001, A 099 730 20 01
• Location on the vehicle: Rear, Left
• Category: Interior Locks & Lock Hardware

Purpose and function of the door lock

The presented lock is dedicated to the rear left side of the W177 series vehicle, responsible for mechanical locking and integration with the central locking system. This component incorporates door security functions, door closure monitoring, and signal transmission to the body electronics, which is essential for interior lighting operation and safety systems.

Thanks to a design compliant with Mercedes factory standards, the lock maintains proper mounting points, geometry, and range of motion, which facilitates installation and reduces the risk of door adjustment issues after replacement.

Construction and installation compatibility

The door lock from this series has been designed to work with the original door handle, linkages, and the vehicle's electrical harness. This means that when correctly selected for a specific body version, there is no need for installation modifications or interference with the door structure.

A used OEM part is a good solution in situations where the existing lock has suffered mechanical wear, collision damage, or issues with locking and unlocking the door have occurred. Maintaining the original specification ensures consistent operation with other components of the locking system.

Benefits of using an original lock

Using a factory lock in the rear left body section allows for maintaining proper central locking operation and daily usage comfort. A correctly selected component:

• ensures correct locking and unlocking of the rear passenger door,
• maintains proper cooperation with body electronics and door position sensors,
• reduces the risk of play, rattling, and leaks resulting from improper mechanism fitment.

For the user, this means stable operation of the locking system and the preservation of factory-level soundproofing and acoustic comfort in the cabin.

Application in the repair process

Replacing the rear door lock is recommended in case of closing issues, lack of response to the remote control signal, door jamming, or incorrect door status indications on the instrument cluster. A used OEM component allows for restoring full functionality while keeping repair costs reasonable, which is particularly important when servicing modern compact class models.

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

Ecological aspect of choosing a used part

Choosing a used door lock is not only a cost-saving measure but also a real reduction in waste and raw material consumption. Reusing functional body components aligns with the trend of responsible vehicle operation and so-called eco-tuning. If you want to better understand how to combine car performance with reducing your carbon footprint through recycled parts, it is worth reading the article Eco-tuning in practice: how to increase performance while reducing your carbon footprint with recycled parts.