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

Left Front Door Lock for Mercedes W901–W905 is an original locking mechanism with a built-in actuator, designed for installation on the driver's side. This component from the Locks and Latches group is responsible for secure door closure, proper locking, and cooperation with the central locking system, directly impacting the vehicle's safety and user comfort.

Specifications and technical data

• SKU: rhd-A9017201235-1
• 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

Intended Use and Vehicle Placement

The presented lock is designed for installation in the left front door of Mercedes W901–W905 series vehicles. Its placement in the driver's door area means this component experiences intensive use during daily driving. Therefore, its proper functioning is crucial for the central locking system, mechanical lock, and correct interaction with the exterior and interior door handles.

Mechanism Construction and Function

The mechanism combines the mechanical part responsible for locking with the electrical part serving as an actuator within a single housing. Thanks to this, the lock:

• performs physical locking and unlocking of the door using the handle or key,
• cooperates with the central locking system and the vehicle's electrical installation,
• ensures stable positioning of the lock latch relative to the body pillar,
• minimizes door play during driving, reducing unwanted noises.

This integration of functions into a single module simplifies diagnostics and replacement – in case of failure, there is no need to separate the actuator from the mechanical part.

Benefits of Using an Original Lock

Using an original left front door lock for the Mercedes W901–W905 ensures factory-level fitment with the door structure and electrical system. Proper mounting geometry and the correct shape of levers and rods translate to smooth handle operation, correct door closing, and predictable central locking system performance. Using an OEM part is also a cost-effective solution while maintaining compatibility with the vehicle's factory security system.

Condition, Fitment, and Identification

The offered lock is a used part from a dismantled vehicle, sold as a used part, allowing for economical repair of the door locking system without compromising original quality. The product should be selected based on manufacturer markings and compatibility with the specific body version, which is facilitated by its assigned stock number, OEM part number, and available interchange numbers. The information about its placement on the vehicle allows for unambiguous confirmation that it is the variant intended for the front left side.

Related Components and Additional Information

When replacing the door lock, it is advisable to check the condition of the rods, handles, and seals around the door to restore full functionality of the entire locking system in one service operation. If you are planning a comprehensive repair or upgrade of the door closing area in your Mercedes and need other parts from the same group, such as locking mechanisms, actuators, or lock cylinders, check the available parts in the Mercedes Locks and Latches category.

If you are also interested in topics related to performance enhancement and exhaust system modifications in cars like Mercedes, BMW, Audi, VW, or Mini, you will find useful information in the article Performance Exhaust Systems: Used Headers and Sport Catalytic Converters on the Road, which discusses practical aspects of selecting and operating used components.