Mercedes W164 ML320 CDI 4-Matic OM642.920 Engine ECU Kit A6421506100 Key Lock

Mercedes W164 ML320 CDI 4-Matic OM642.920 Engine ECU Kit is a set from the Electronic control modules and controllers category, designed for precise management of the powertrain's operation. The kit includes the engine ECU along with the key, which facilitates matching to the vehicle and reduces the risk of immobilizer-related issues. This is a solution for users who expect stable engine performance and efficient communication with the vehicle's electrical system.

Specifications and technical data

• SKU: A6421506100-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421506100
• Substitutable numbers: A6421506100, A 642 150 61 00, A1645451508, A 164 545 15 08
• Category: ECUs & Computer Modules

Purpose and function of the engine controller

The presented engine computer is a component responsible for advanced control of the OM642.920 unit in the Mercedes W164 ML320 CDI model. The module analyzes signals from sensors, selects the fuel dose, injection timing, and operating parameters of the accessories to ensure proper dynamics, smooth operation, and emission control. Using an original ECU from this series allows for maintaining consistency with the vehicle's factory electronic architecture.

Advantages of the ECU kit with key

A significant feature of this set is the presence of a key paired with the control module, which in practice:

• facilitates integration with the immobilizer system and the vehicle's electrical installation,
• reduces the need for extensive programming from scratch,
• speeds up the process of replacing a damaged controller,
• decreases the risk of engine start authorization issues.

For workshops and users, this means more predictable installation and the possibility of more efficient diagnostics after installation. The module comes from a Mercedes vehicle, ensuring compatibility with the communication bus and the logic of the onboard systems.

Characteristics of the Electronic control modules and controllers category

Products from the Electronic control modules and controllers group are responsible for communication between sensors, actuators, and the vehicle's main systems. In the case of an engine controller, it is crucial to properly match it to the specific engine version and equipment configuration. When choosing a used ECU module, it is worth paying attention to:

• compatibility with the engine type and vehicle generation,
• possibility of adaptation to the existing installation,
• history of the component's origin,
• professional installation and subsequent diagnostics.

This kit is intended for users who want to restore the proper operation of the engine control system without interfering with the mechanical construction of the unit.

Condition, installation, and practical application

The offered set is a used product, which in practice allows for an economical repair of the vehicle while maintaining the manufacturer's original specifications. Before installation, it is recommended to perform full vehicle diagnostics and consult with an automotive electrician to properly code and adapt the module to the specific car. Professional installation minimizes the risk of communication errors with other controllers and ensures stable operation of the powertrain.

ECU selection and technical knowledge

When choosing a used engine controller, it is crucial to match it based on the manufacturer's markings and the vehicle's configuration. Detailed information regarding selection, hardware and software compatibility, as well as practical installation tips can be found in the Global Parts guide: Used automotive electronics – ECU modules and sensors in practice. The article explains how to safely use used electronics and what to look for when purchasing.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as controllers, management modules, or other ECU units, check the available parts in the Mercedes electronic control modules and controllers category.