Mercedes W204 W212 Front Door Lock Mechanism Actuator Left N/S A0997200735

Mercedes W204 W212 Front Door Lock Mechanism Actuator Left N/S is an original locking mechanism designed for installation on the driver's side. This component is responsible for precise locking, unlocking, and integration with the central locking actuator, ensuring safe and stable door operation during daily use. This solution is dedicated to users who expect factory-fit quality and seamless compatibility with the vehicle's electronics.

Specifications and technical data

• SKU: RHD-A0997200735-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0997200735
• Substitutable numbers: A0997200735, A 099 720 07 35
• Location on the vehicle: Front, Left
• Part type: Door Lock
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock mechanism is designed for installation in the front left door, i.e., on the driver's side. It is responsible for:

• mechanical locking and unlocking of the door,
• transferring drive from the actuator to the lock mechanism,
• cooperation with the central locking system as well as internal and external door handles,
• maintaining a stable door position while driving and when parked. Thanks to a design compliant with Mercedes factory standards, the lock maintains proper operating geometry, which reduces the risk of play, rattling, or problems with closing the door.

Construction and technical features

The lock mechanism belongs to the Locks and latches group, which means it is designed to withstand the loads resulting from frequent opening and closing of the door. Its construction includes:

• a set of gears and levers responsible for the bolt movement,
• an integrated electric drive (actuator) working with the central locking system,
• mounting points matched to the factory mounting holes in the door. Such a solution allows for maintaining proper rigidity of the connection with the door panel and correct cooperation with other elements of the locking system.

Benefits of using an original lock

Choosing an original front left door lock for Mercedes W204 / W212 provides a number of practical benefits:

• Factory fit – no need for modifications, drilling, or adjusting mounts.
• Correct cooperation with electronics – proper response to signals from the remote control, lock cylinder, and internal buttons.
• Consistency with safety systems – proper door locking while driving and after locking the vehicle.
• Stable mechanical operation – reduction of problems with doors not closing, bouncing back, or irregular central locking operation. The component from this group is particularly important in vehicles used intensively, where the locking system operates many times a day and must maintain consistency of operation.

Condition and service application

The offered lock comes from the used original parts segment, which allows for economical repair while maintaining factory specifications. This is a good solution in situations where:

• the original lock has worn out or suffered mechanical damage,
• there are problems with the central locking on the driver's side,
• the door does not lock or unlock properly,
• it is necessary to replace the complete mechanism instead of performing temporary repairs. Using parts from the same design group allows for shortening service time and facilitates installation in workshop conditions or during DIY repairs.

Expanding the Mercedes locking system

If you are planning a comprehensive repair or upgrade of the door and lock area 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. For users interested in deepening their knowledge about parts selection, compatibility, and verification by VIN number, our technical guide regarding BMW turbocharging systems may be helpful – you can find it in the article BMW B58 code, or 340 HP from the secondary market – a checklist before buying a turbocharger and intercooler for the BMW 3 Series (G20), which shows how to consciously approach the purchase of components from the secondary market.