Mercedes W166 Door Lock Front Left N/S Actuator Latch A1667230314

The Mercedes W166 Front Left Door Lock is an original part from the Locks and Latches group, designed for installation in the front left door of Mercedes W166 vehicles. The precise design of the lock ensures proper cooperation with the factory opening, locking, and securing mechanism of the door, which translates to safe and predictable operation of the entire system.

Specifications and technical data

• SKU: A1667230314
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667230314
• Substitutable numbers: A1667230314, A 166 723 03 14
• Location on the vehicle: Front, Left
• Category: Exterior Locks & Lock Hardware

Purpose and Vehicle Placement

The presented lock is dedicated for installation in the front left door (driver's side in left-hand drive vehicles) of the Mercedes W166 body. Its placement in the front door area means the component is responsible for key functional aspects: opening from the outside and inside, central locking, and cooperation with factory safety systems.

Choosing a lock that matches the W166 door construction minimizes the risk of fitting issues, leaks, or improper operation of the handle and rods. This is particularly important when replacing a part after a collision, mechanical wear, or failure of the locking system.

Construction and Technical Function

The front left door lock in the Mercedes W166 is an integrated mechanical latching module that works with rods, the external and internal door handle, and the vehicle's central locking system. The manufacturer-designed construction ensures:

• stable locking of the door leaf relative to the body pillar,
• proper guidance of the lock bolt during closing,
• appropriate cooperation with the handle mechanism and the lock cylinder (if present),
• compatibility with factory solutions used in the W166 platform.

Thanks to the use of original Mercedes construction, the lock maintains correct assembly tolerances, which reduces play, creaks, and improper door closing, and also helps maintain the appropriate rigidity and sealing of the door area.

Benefits of Using an Original Door Lock

Choosing an original front left door lock for the Mercedes W166 is a solution that allows you to maintain the factory operating parameters of the opening and locking system. In practice, this means:

• reliable door closing and opening without excessive force,
• proper cooperation with the central locking system and vehicle wiring,
• reduced risk of repeated service interventions in this area,
• maintained acoustic comfort due to proper door closing.

A part from the Locks and Latches group, selected according to the W166 construction, is particularly recommended for post-accident repairs and for replacing worn mechanisms when preserving the original functionality and ergonomics of the driver's door is important.

Condition, Installation, and Service Application

The offered lock is a used part from disassembly, which is a cost-effective solution while maintaining compliance with the factory Mercedes specification. This type of part is suitable for both routine repairs and comprehensive bodywork and mechanical work on the front left door.

During installation, it is recommended to:

• check the condition of the door guides, hinges, and handle,
• verify the correct alignment of the door relative to the body after installation,
• test the operation of the central locking system and locking mechanism after each service operation.

Repair Extension – Mercedes Locks and Latches

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

More About Using Used Parts

If you are interested in a broader context of using second-hand components in premium cars, including German brands, it is worth familiarizing yourself with practical tips on selecting and installing such parts. Useful information can be found in the article Audi on Second-Hand Parts – Tuning and Repairs Without Quality Loss, which shows how to wisely use used components while maintaining high vehicle operational quality.