Door Lock Mercedes W204 W212 SLK R172 Front Left N/S Actuator Latch A2047203735

Door Lock Mercedes W204 W212 SLK R172 Front Left N/S Actuator Latch is an original locking mechanism designed for installation in the front left door of Mercedes mid-size and sports vehicles. The component combines the function of a mechanical lock and an actuator, ensuring secure locking, smooth operation with the central locking system, and proper handling of both internal and external door handles. Thanks to its factory design, it fits dedicated models without the need for modifications, which facilitates servicing and reduces repair time.

Specifications and technical data

• SKU: RHD-A2047203735-6
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2047203735
• Substitutable numbers: A2047203735, A 204 720 37 35, A0997200735, A 099 720 07 35
• Location on the vehicle: Front, Left
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock belongs to the Locks and Latches category and is intended for installation in the front left door (driver's side in left-hand drive vehicles). It is responsible for:

• mechanical locking of the door when closing,
• cooperation with the central locking system and remote control,
• correct transmission of movement from the external and internal handles,
• maintaining a stable door position while driving.

Thanks to a design tailored to Mercedes W204, W212, and SLK R172 bodies, the lock maintains factory mounting geometry and works with original guides, cables, and the electrical harness.

Benefits of using an original door lock

Using an original door lock in a Mercedes provides measurable service and utility benefits:

• Factory fit – maintaining the original position relative to the door panel and pillar, without the need to modify mounting holes.
• Stable central locking operation – correct locking and unlocking in all modes (opening via remote, key, or from the inside).
• Consistency with safety systems – proper cooperation with the door opening mechanism in emergency situations.
• Noise and play reduction – proper door closing reduces the risk of rattling and unwanted vibrations while driving.

Technical characteristics and installation

The lock mechanism combines a mechanical part with an actuator module, allowing for control via the vehicle's electrical system. The design is intended for operation in the front left door, taking into account the specific routing of cables and the position of the handle and lock cylinder in Mercedes C-Class, E-Class, and SLK bodies.

During installation, it is recommended to:

• remove the door upholstery and carefully disconnect the handle cables,
• check the condition of seals and window guides,
• verify the correct operation of the lock after connection – both from the remote and internal buttons.

A properly installed lock ensures repeatable, secure door locking and correct cooperation with the existing vehicle installation.

Component condition and service application

The offered front left door lock is a used component, making it an attractive solution for maintenance repairs and restoring vehicle functionality after mechanical door damage. Replacing the lock is particularly recommended in the case of:

• problems with closing or locking the door,
• lack of response from the central locking on one side of the vehicle,
• damage after a collision in the area of the left front door.

Thanks to the preservation of the original design, the component works well as a service part in Mercedes C-Class (W204), E-Class (W212), and SLK R172 vehicles, allowing for the maintenance of technical consistency of the entire locking system.

Expanding the locking system and service knowledge

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, actuators, or additional locking modules, check the available parts in the Mercedes Locks and Latches category.

To better understand why original used components for premium cars are currently so eagerly chosen by workshops and conscious drivers, it is worth reading the article Crisis in the new parts market? Why in 2026 used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend, which discusses current market realities and the advantages of using proven OEM components.