Mercedes W166 R231 Door Lock Front Right O/S Latch Catch Actuator A0997201801

Right Front Door Lock Mercedes W166 / R231 is an original part from the Locks and Latches group, designed for precise operation of the locking mechanism on the passenger side. This used, fully functional door actuator and latch ensures proper integration with the factory electrical system and comfortable, secure door closing and opening in premium Mercedes vehicles.

Specifications and technical data

• SKU: RHD-A0997201801
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0997201801
• Substitutable numbers: A0997201801, A 099 720 18 01
• Location on the vehicle: Front, Right
• Category: Exterior Locks & Lock Hardware

Purpose and Vehicle Placement

The presented lock is designed for installation in the right front door, meaning it is responsible for locking and unlocking the passenger-side door in Mercedes vehicles. Its placement in the vehicle has been factory-optimized for:

• proper routing of rods and cables inside the door,
• cooperation with the exterior and interior door handles,
• integration with the factory central locking and alarm system,
• stable mounting to the door structure without requiring modifications.

Construction and Technical Function

The right front door lock actuator for Mercedes W166 / R231 combines a mechanical latch and an electrical component responsible for controlling the locking mechanism within a single housing. The OEM construction is designed to fit factory mounting points, ensuring an organized and predictable installation process for the mechanic.

This component is responsible for, among other things:

• mechanically locking and releasing the door latch,
• transmitting signals to comfort modules and the central locking system,
• cooperating with the remote control system and any alarm,
• maintaining a stable door position during driving and when parked.

Thanks to its factory design, compatibility with Mercedes electronics is maintained, which reduces the risk of communication errors within the vehicle network after replacing the part.

Benefits of Using an Original Mercedes Lock

Choosing the original right front door lock for Mercedes W166 / R231 is a solution that technically aligns with the vehicle manufacturer's specifications. In practice, this means:

• precise fit to the door structure – no need for modifications to mountings or wiring harness,
• preservation of the factory operating characteristics of the door handles and central locking system,
• consistency with existing control modules in the vehicle,
• reduced risk of leaks and improper door closing after repair.

A used OEM part is a good choice for routine repairs when technical compatibility with factory equipment and a reasonable service cost are priorities.

Practical Installation Tips

When replacing the right front door lock in a Mercedes W166 / R231, it is worth paying attention to several installation aspects:

• correct routing of rods and cables between the lock and the door handles,
• checking the condition of the wiring harness in the door,
• verifying the operation of the central locking system and lock after installation,
• precise adjustment of the window and seals after reassembling the door panel.

After installation, it is recommended to perform a test of all locking functions using the remote control and the buttons inside the vehicle to confirm proper cooperation of the lock with the comfort system.

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

For drivers interested in a broader approach to vehicle servicing and modernization, including an analysis of selecting components for the charging and air cooling system in BMW gasoline engines, the Global Parts advisory article may be helpful: BMW Code B58 – Pre-Purchase Checklist for Turbocharger and Intercooler for BMW 3 Series (G20).