Mercedes W177 Door Lock Front Right O/S Mechanism Actuator A0997201802

Description

Mercedes W177 Door Lock Front Right O/S Mechanism Actuator is an original locking mechanism with an actuator, designed for installation on the passenger side in the front door. The component belongs to the Locks and latches group, ensuring precise closing and secure locking of the door while maintaining the factory operating characteristics of the central locking system.

Specifications and technical data

• SKU: rhd-A0997201802
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0997201802
• Substitutable numbers: A0997201802, A 099 720 18 02, KD
• Location on the vehicle: Front, Right
• Category: Exterior Locks & Lock Hardware

Purpose and vehicle placement

The presented lock mechanism has been designed specifically for the Mercedes A-Class W177 body and is mounted in the front right door. It is responsible for interacting with the external and internal handles, linkages, and the vehicle’s electrical installation, integrating the mechanical locking function with the electrical control of the central locking system.

Thanks to its dedicated placement within the door structure, the lock ensures proper bolt guidance, stable positioning of the lock tongue relative to the pillar, and correct interaction with position sensors, which translates into reliable door locking and unlocking in daily operation.

Mechanism construction and function

The mechanism combines in one housing the mechanical part responsible for locking with the electrical part acting as an actuator. This design allows for:

• consistent operation with the factory central locking and comfort system,
• precise transfer of movement from handles and linkages to the door bolt,
• monitoring of the locking status by the vehicle’s electronic systems.

The original craftsmanship characteristic of the Mercedes brand ensures the correct geometry of the mounts, proper guidance of moving parts, and compatibility with factory electrical harnesses, which facilitates installation and reduces the risk of improper lock operation.

Benefits of using an original door lock

Using a factory front right door lock in a Mercedes W177 allows for maintaining consistency with the other elements of the locking system. The most important advantages include:

• Compatibility with the W177 body – original mounting points and geometry interacting with the handles and pillar are preserved.
• Proper interaction with electronics – the mechanism is adapted to work with the factory central locking control and comfort systems.
• Stable door locking – the design ensures repeatable locking and unlocking, which affects the safety of vehicle use.

Choosing an original element from the Locks and latches group reduces the risk of fitment issues, improper door closing, or errors in comfort systems that may occur with parts inconsistent with the factory specification.

Condition and service application

The offered lock is a used part, which makes it an attractive service solution for post-accident repairs, replacing a damaged mechanism, or restoring full functionality of the central locking in a Mercedes W177. This type of component is particularly useful when symptoms occur such as problems with locking a single door, lack of response to remote commands, or unstable closing on the passenger side.

Thanks to the preservation of the factory design, the lock can be integrated into the existing system without the need for installation modifications or mounting alterations, which shortens workshop time and facilitates maintaining the vehicle in accordance with the manufacturer’s original design.

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

To better understand the importance of selecting the right, original components and how to search for them using identification numbers, it is worth reading the practical tips and examples described in the article Audi’s five-cylinder engine – a legend from Quattro to RS3 and how to maintain it with original Audi parts, where the principles of selecting used OEM parts are discussed, among other topics.