Door Lock Mercedes W204 W212 SLK R172 Front Left N/S Actuator Latch A1727600940

Left Front Door Lock for Mercedes W204 / W212 / SLK R172 is an original part from the locks and latches category, designed for precise integration with the vehicle's factory locking system. This complete latch and actuator mechanism ensures proper locking, unlocking, and secure closing of the left front door, in accordance with Mercedes manufacturer standards.

Specifications and technical data

• SKU: rhd-A2047203735-5
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1727600940
• Substitutable numbers: A1727600940, A 172 760 09 40
• Location on the vehicle: Front, Left
• Category: Exterior Locks & Lock Hardware

Intended Use and Compatibility with Mercedes Models

The presented door lock is designed for installation in the left front door of Mercedes C-Class (W204), E-Class (W212), and SLK Roadster (R172) vehicles. The construction, based on OEM solutions, guarantees correct positioning relative to the door panel, window, and guides, which translates to stable mechanism operation and proper door leaf closure.

The vehicle placement is clearly defined as the front left side, which simplifies part selection during servicing and minimizes the risk of errors. Using an original lock maintains consistency with the factory central locking system, alarm, and comfort opening functions.

Mechanism Construction and Actuator Function

The component integrates the mechanical door latch with the actuator unit within a single housing. This integrated design:

• ensures smooth door locking and unlocking via remote control or key,
• enables cooperation with the central locking system and body electronics,
• maintains a stable position of the lock latch relative to the striker on the pillar.

Thanks to the original Mercedes design, the correct geometry of rods and cables is preserved, reducing resistance when opening with the interior and exterior handles. The lock is prepared for operation under typical usage conditions, considering the loads resulting from frequent door opening and closing.

Benefits of Using an Original Lock and Latch

Using the original left front door lock in Mercedes W204, W212, or SLK R172 offers a range of practical service and user benefits:

• Factory Fitment – no need for modifications to mounts, holes, or wiring harnesses; installation according to service documentation.
• Seamless Electronic Integration – proper communication with comfort modules and the central locking system, avoiding issues with low-quality aftermarket replacements.
• Stable Mechanical Operation – correct door closure, reduced play and rattling caused by imprecise fitting.
• User Safety – secure locking of the door leaf while driving and parked, as per manufacturer specifications.

Condition, Verification, and Service Application

The offered door lock is a used part, sourced from disassembly, which is an advantageous solution for users seeking original components at a reasonable price. This type of part is particularly useful for:

• repairing a malfunctioning central locking system on the driver's or front passenger's side,
• resolving issues with doors not closing properly or not responding to remote signals,
• restoring full door functionality after a collision or bodywork intervention.

It is always advisable to confirm part selection based on the OEM part number and interchangeable numbers to ensure full compatibility with the specific vehicle body version and model year.

Other Mercedes Locks and Latches and Technical Knowledge

If you are looking for other Mercedes locks and latches for your car, check out the Mercedes locks and latches available in our assortment to select the appropriate part for other doors or the trunk lid.

For drivers interested in a broader perspective on the quality of used original parts and their impact on vehicle longevity, we recommend the guide article about the Bavarian brand: BMW – Sporty Performance and Precision. How Used Original Parts Extend the Life of the Bavarian Icon?. Although it concerns a different manufacturer, the procedures for selection by OEM numbers and practical service tips described there are also helpful when operating Mercedes cars.