Door Lock Mercedes W177 Rear Left N/S Latch Mechanism Actuator A0997302701

Visual condition of the part

The product shows signs of use visible in the photos.

Door Lock Mercedes W177 Rear Left N/S Latch Mechanism Actuator is an original component from the Doors and door panels group, designed for installation in the rear, left part of the vehicle body. The precise design of the lock ensures proper latching, compatibility with the handle mechanism, and stable door closing, which translates into safe and predictable operation of the entire door system.

Specifications and technical data

• SKU: A0997302701
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0997302701
• Substitutable numbers: A0997302701, A 099 730 27 01
• Location on the vehicle: Rear, Left
• Category: Doors & Door Skins

Purpose and vehicle placement

The presented lock is dedicated to the rear, left side of the body in the Mercedes W177 class model. It is responsible for the mechanical latching of the door, as well as interaction with the linkages, handle, and other elements of the opening and closing mechanism. Thanks to its precise fit to the door structure, this component allows for maintaining the factory geometry of the door's operation and proper sealing against the weatherstrips.

Its placement in the rear part of the body makes the lock essential both for the comfort of passengers in the back seat and for the overall rigidity of the door closure while driving. A properly selected component reduces play, unwanted noises, and improves the perceived quality of the door's operation.

Technical and functional characteristics

As an original Mercedes brand component, the lock is designed for direct compatibility with the factory W177 door structure. This means compliance with the manufacturer's intended mounting method, linkage routing, and the operating range of the mechanism. The lock's design ensures:

• stable latching of the door leaf when closed,
• smooth release of the latch when opening from the inside and outside,
• proper cooperation with factory door components,
• maintenance of the correct door position relative to the body.

Proper fitment to the specific model reduces the risk of installation problems, leaks, or improper closing, which is particularly important in modern body constructions.

Condition of the component and benefits of using OEM parts

The offered door lock comes from a used vehicle, which allows for a favorable cost-to-quality ratio while maintaining the manufacturer's original specifications. Using OEM parts in the door area minimizes the risk of mismatch, typical of universal aftermarket replacements, and facilitates installation in a service center or independent workshop.

For the user, this means:

• preserving the factory character of the door mechanism's operation,
• consistency with other elements of the locking system,
• reduction of time required for adjustment and alignment.

Application in service practice

Replacing the rear left door lock is recommended in situations where problems with closing, latching, or opening the door occur, as well as after mechanical damage within the door leaf. Using an original component allows for restoring the proper operation of the system without the need for modifying the door structure.

If you are planning a comprehensive repair or modernization of the side body zone in your Mercedes and need other elements from the same group, such as skins, reinforcements, or complete door leaves, check the available parts in the Doors and door panels Mercedes category.

Support in choosing parts

When selecting a door lock for a specific equipment version and model year, it is worth paying attention to compatibility with the manufacturer's markings and vehicle configuration. In case of doubts regarding the choice between a new and a used component, comparing quality and cost parameters may be helpful.

A detailed discussion of the differences between new and used components, along with practical examples and answers to frequently asked questions, can be found in the article New or used? A comparison of costs and quality of car parts.