Mercedes W164 ML320 CDI 642.940 224HP Engine Unit ECU Kit A6421506491 Key Lock

Mercedes W164 ML320 CDI 642.940 224HP Engine Unit ECU Kit Key Lock is a practical solution for vehicles equipped with the 642.940 unit producing 224HP. This used set from the Electronic control modules and controllers category allows for an efficient replacement of the factory engine control system in automatic transmission and diesel-powered versions, ensuring powertrain electronics consistency. Thanks to the completeness of the components, the system is ready for integration with the vehicle's installation.

Specifications and technical data

• SKU: A6421506491-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421506491
• Substitutable numbers: A6421506491, A 642 150 64 91, 0281013382, 0 281 013 382, A1645450708, A 164 545 07 08
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented Mercedes W164 ML320 CDI 642.940 224HP Engine Unit ECU Kit Key Lock is dedicated to the Mercedes M-Class W164 generation, specifically the ML320 CDI version with the 642.940 engine. In one set, you receive the central module controlling the powertrain operation and the components responsible for ignition authorization, which facilitates matching the electronics to a specific vehicle configuration.

The ECU in this model is responsible for precise management of fuel injection, engine auxiliary equipment, and cooperation with the automatic transmission. Using the correct kit allows for maintaining proper communication between the engine controller, comfort modules, and safety systems, which is important for both the engine's operating culture and the stability of the entire powertrain.

Benefits of using a complete kit

Choosing a complete ECU kit with a key and lock is particularly advantageous when replacing electronics in vehicles with extensive security systems. Using components from a single system:

• facilitates matching the controller to the existing electrical installation,
• reduces the need for advanced programming and adaptation,
• ensures consistency between the engine controller and the ignition system,
• reduces the risk of communication conflicts in the vehicle's CAN network.

For workshops specializing in the Mercedes brand, such a kit is a convenient service solution, allowing for reduced diagnostic and assembly time. For the end user, it means a more efficient repair and greater predictability of the powertrain's operation after replacement.

Application in vehicles with diesel engines and automatic transmissions

The discussed kit is intended for versions with a diesel engine and an automatic transmission, which is significant when selecting a controller. In vehicles with such a powertrain, the ECU cooperates with the transmission control module, traction control system, and injection system, which is why the correct matching of fuel type and transmission type is crucial for the proper operation of the entire system.

In practice, this means that the kit has been designed to handle the torque characteristics of the diesel engine, automatic gear shifting strategies, and cooperation with factory driver assistance systems. Thanks to this, after proper installation and configuration, it is possible to maintain the original operating parameters of the powertrain.

Characteristics of the used product

The offered set comes from dismantling, which makes it an attractive alternative to new OEM components in terms of repair costs. A used engine controller along with a matched key and lock allows for an economical restoration of the electronic system's efficiency while maintaining the manufacturer's original specifications. This type of solution is often chosen by workshops specializing in automotive electronics repairs and by informed users looking for parts consistent with the factory configuration.

Mercedes electronic control modules – expansion and service

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 engine controllers, comfort modules, or transmission management units, check the available parts in the Mercedes electronic control modules and controllers category.

Technical support and electronics selection

When working with advanced premium vehicle electronics, it is worth using reliable sources of knowledge regarding diagnostics and installation of control modules. For a better understanding of the principles of modern electronic systems and how to use dismantled parts in repairs, read the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using dismantled parts?, which discusses a practical approach to servicing controllers and modules in premium cars.