Mercedes X166 Door Lock Latch Mechanism Rear Right O/S Assembly A0997304800

Mercedes X166 Door Lock Latch Mechanism Rear Right O/S Assembly is an original locking mechanism designed for installation on the rear right side of the vehicle body. This component from the Locks and Latches group ensures proper closing, locking, and unlocking of the door, which translates into safe and predictable operation of the locking system in your Mercedes.

Specifications and technical data

• SKU: RHD-A0997304800
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0997304800
• Substitutable numbers: A0997304800, A 099 730 48 00
• Location on the vehicle: Rear, Right
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock mechanism is dedicated to the rear right side of the body in X166 series models, where it is responsible for mechanical locking and integration with the central locking system. A properly functioning lock in this area of the vehicle is crucial for:

• maintaining stable door closure while driving,
• correct operation of external and internal door handles,
• cooperation with the actuator and the electrical installation of the central locking system,
• maintaining the factory safety level for passengers in the rear seat.

The placement on the vehicle on the rear right side allows for precise alignment with factory mounting points and door guides.

Construction and compatibility with the door system

The lock mechanism was designed by Mercedes as an integral part of the door structure, working with factory linkages, handles, and control wiring. Thanks to this:

• the correct positions of catches and levers relative to the door panel are maintained,
• the mechanism works with the original striker on the body pillar,
• correct adjustment of the closing is possible without interfering with the door structure.

Such a solution reduces the risk of play, rattling, or improper closing, which often occur with parts that do not comply with the manufacturer's design.

Condition, origin, and advantages of using a used part

The offered door lock comes from the group of used original parts, which in practice means maintaining the factory geometry, mounting points, and operating characteristics. Compared to aftermarket replacements, this allows for:

• easier installation in the existing door structure,
• consistency of operation with other elements of the locking system,
• reduction of the need for additional adjustments after installation.

Choosing an original, used mechanism is often a reasonable solution for repairing vehicles a few years old, combining the economic aspect with maintaining the proper quality of workmanship.

Benefits of a properly functioning rear right door lock

A functional rear right door lock affects not only the comfort of use but also the safety of transported passengers. A properly selected and installed component ensures:

• secure door locking every time it is closed,
• stable cooperation with the central locking system and any comfort functions,
• reduction of unwanted noises resulting from play in the mechanism,
• maintenance of the correct door line relative to the body after closing.

Thanks to this, daily use of the vehicle remains predictable, and door operation does not require excessive force or additional adjustments.

Expanding the locking system and selecting related components

If you are planning a comprehensive repair or upgrade of the door lock zone 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.

If you are interested in a broader approach to vehicle modernization and want to better utilize the potential of aftermarket parts, check out the article The best used parts for tuning your car, where you will find practical tips on selecting used components.