Door Lock Mercedes W901 W905 Front Left N/S Latch Mechanism Actuator A9017201235

Door Lock Mercedes W901 W905 Front Left N/S Latch Mechanism Actuator is a precision locking mechanism designed for installation on the driver's side. This complete latch mechanism with actuator is responsible for secure locking, unlocking, and integration with the central locking system, ensuring safe and predictable door operation during daily use. Thanks to its factory design dedicated to the W901–W905 series, it maintains correct operating geometry and compatibility with original door components.

Specifications and technical data

• SKU: rhd-A9017201235
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A9017201235
• Substitutable numbers: A9017201235, A 901 720 12 35
• Location on the vehicle: Front, Left
• Category: Exterior Locks & Lock Hardware

Purpose and vehicle placement

The presented lock is designed for installation in the front left door, within the closing and latching area of the door panel. It is responsible for:

• mechanical door locking on the driver's side,
• transferring movement from the external and internal handle to the latch mechanism,
• cooperation with the central locking actuator for synchronized vehicle opening and closing.

The dedicated placement on the vehicle reduces the risk of fitment issues, leaks, or incorrect latch operation after installation.

Mechanism construction and actuator function

The mechanism combines the mechanical part of the lock and the actuator component in a single housing. This configuration allows for:

• stable guidance of the latch and pawls while closing the door,
• consistent operation with the electrical system responsible for central locking,
• reduction of play and noise resulting from the wear of individual, mismatched components.

The solution used in Mercedes W901–W905 models ensures repeatable lock operation, which translates into user comfort – the door closes with the proper resistance, and the response to the signal from the remote control or lock cylinder remains predictable.

Benefits of using an original door lock

Using a dedicated lock from the Locks and latches group in a Mercedes vehicle provides a number of practical benefits:

• preservation of factory mounting geometry in the door and on the pillar,
• correct cooperation with standard rods, handles, and electrical wiring,
• reduction of the risk of problems with closing, door bouncing, or incomplete locking,
• consistency of operation with the existing central locking and alarm system.

For vehicles used intensively – e.g., in transport or services – a functional driver's door lock has a direct impact on the ergonomics of daily work and the safety of the transported cargo.

Component condition and service application

The offered front left door lock is a used part, which allows for an economical repair of the locking system while maintaining compliance with the original Mercedes design. This solution is particularly beneficial in the case of:

• central locking actuator failure in the driver's door,
• mechanical damage to the lock after a collision or attempted break-in,
• excessive wear of the mechanism manifesting as jamming or lack of response to controls.

Replacing the complete mechanism with the actuator is often faster and more predictable than repairing individual sub-assemblies, which facilitates workshop work and reduces vehicle downtime.

Repair expansion and additional materials

If you are planning a comprehensive repair or upgrade of the door lock area in your Mercedes and need other elements from the same group, such as locking mechanisms, actuators, or lock cylinders, check the available parts in the Mercedes Locks and latches category.

For users interested in optimizing service costs using used parts and analyzing the durability of solutions used by different manufacturers, an article comparing popular power units may be helpful – you can find it here: Volkswagen 1.9 TDI vs 1.4 TSI – evolution of VW engines and repair costs.