Mercedes C118 W177 Door Lock Left N/S Actuator Latch Catch A0997201702

Mercedes C118 W177 Door Lock Left N/S Actuator Latch Catch is an original component from the Locks and Latches group, designed for precise operation of the locking and latching mechanism on the left side of the vehicle. The design, based on the factory Mercedes solution, ensures proper integration with the electrical installation and central locking system, resulting in stable and predictable operation of the system. It is a practical choice for door repairs when you want to maintain factory functionality and fitment.

Specifications and technical data

• SKU: rhd-A0997201702-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0997201702
• Substitutable numbers: A0997201702, A 099 720 17 02
• Location on the vehicle: Left
• Category: Exterior Locks & Lock Hardware

Purpose and function of the left door lock

The presented door lock is intended for installation on the left side of the body in selected Mercedes C118 and W177 series models. It is responsible for the mechanical latching of the door, interaction with the handle, actuator, and position sensors, as well as the correct transmission of signals to the vehicle's comfort and security systems. Thanks to the factory design, the correct geometry of the catch and the appropriate closing force are maintained, which reduces the risk of play, rattling, and leaks in the door area.

Construction and fitment to the Mercedes system

The lock has been designed as an element integrating the mechanical part with the actuator module, which allows for control of the central locking system and interaction with factory comfort functions. The construction allows for installation in the original mounting points in the door, without the need for bodywork modifications or wiring adaptations. As a result, the following are maintained:

• correct positioning relative to the pillar and catch,
• consistency with factory wiring and connectors,
• proper operation of the internal and external handle mechanism.

Such fitment reduces service time and facilitates the diagnosis of potential faults in the future.

Benefits of using an original door lock

Using an original door lock on the left side in a Mercedes C118 / W177 allows you to maintain the consistency of the entire locking system. In practice, this means:

• stable cooperation with the central locking system and body electronics,
• preservation of factory safety parameters when the door is closed,
• proper operation of comfort functions, such as locking via remote control or the button inside the cabin,
• easier identification and service handling due to compliance with manufacturer documentation.

This solution is particularly beneficial for post-accident repairs or replacing a worn-out mechanism when the priority is to maintain the original operating characteristics of the door.

Condition of the component and service application

The offered lock comes from the secondary market, which makes it a reasonable cost-effective alternative to a new component while maintaining the factory design. It works well both for point replacement of a damaged lock and for broader service work in the door area, including adjustment, handle replacement, or electrical system repair. Thanks to its original origin, you minimize the risk of compatibility issues and the need for additional mounting modifications.

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

Additionally, if you want to expand your knowledge on selecting used OEM components by catalog numbers or VIN, and learn practical tips regarding the operation of advanced drive units, it is worth reading the article Audi five-cylinder engine – a legend from Quattro to RS3 and how to take care of it using original Audi parts, which discusses best practices when choosing original components.