Door Lock Mercedes ML W166 Front Left N/S Mechanism Actuator A1667200735

Door Lock Mercedes ML W166 Front Left N/S Mechanism Actuator is an original mechanism from the Locks and Latches category, designed to control the locking and unlocking of the front left door. This component integrates the function of a mechanical lock with an actuator, ensuring secure closing, compatibility with the central locking system, and proper operation of the comfort system in your Mercedes.

Specifications and technical data

• SKU: rhd-A1667200735-3
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667200735
• Substitutable numbers: A1667200735, A 166 720 07 35, A0997201501, A 099 720 15 01
• Location on the vehicle: Front, Left
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock is dedicated for installation in the front left door of the vehicle, on the driver's side for right-hand drive versions. It is responsible for:

• mechanical locking and unlocking of the door,
• cooperation with the central locking and comfort closing system,
• proper interaction with the external and internal door handle,
• monitoring the door closure status for the vehicle's electronics.

By using an original mechanism, the factory operating characteristics of the lock are maintained, which reduces the risk of errors in the comfort and safety systems.

Mechanism construction and benefits of using OEM parts

The lock combines a mechanical part with an electric actuator in one housing, which enables fast and repeatable door locking. The OEM design is matched to the factory guides, linkages, and electrical harness, ensuring that:

• installation is predictable and straightforward,
• there is no need for modifications to the installation or mounting elements,
• compatibility with factory controller settings is maintained.

Choosing an original lock translates into stable operation of the locking system and reduces the risk of improper door closing or random opening while driving.

Condition, fitment, and service application

The component comes from a used vehicle, making it an attractive cost-effective alternative to a new part while maintaining the manufacturer's original specifications. The lock is intended for direct installation in the appropriate Mercedes ML W166 model at the front – left side position, using factory mounting points.

Before installation, it is recommended to perform a standard check of the door installation (guides, linkages, wiring harness condition) and carry out an adaptation in the comfort controller if required by the service procedure for the specific vehicle. This approach allows for consistent operation of the central locking system and helps avoid secondary faults.

Application in repairs and upgrades

This door lock is suitable both for a typical replacement of a damaged mechanism and for more extensive service work related to the locking system, e.g., after a collision or interference with the door wiring harness. Due to the preservation of the original design, it is particularly recommended in situations where you want to:

• maintain the factory level of passive safety,
• ensure proper cooperation with the alarm and comfort system,
• avoid problems with the fitment of low-quality replacements.

Related components and additional information

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

When working on the drivetrain or during major repairs of transmission assemblies, practical tips on assessing the condition of used components may be helpful – you can find them in the guide Second-hand differential – what you need to know about used differentials, sensors, and drivetrain systems, which facilitates making informed purchasing decisions when choosing used parts.