Mercedes W164 ML320 OM642.940 224HP Diesel Engine Unit ECU Kit A6421502077 + Key

Mercedes W164 ML320 OM642.940 224HP Diesel Engine Unit ECU Kit + Key is a solution designed for vehicles with a diesel engine and an automatic transmission. The set belongs to the Electronic control modules and controllers group and is configured as an Engine Control Unit dedicated to a specific powertrain configuration, which facilitates matching during repair or replacement of a damaged system.

Specifications and technical data

• SKU: A6421502077-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421502077
• Substitutable numbers: A6421502077, A 642 150 20 77, 0281013969, 0 281 013 969, A1645450908, A 164 545 09 08
• Fuel type: Diesel
• Gearbox type: Automatic
• ECU type: Engine Control Unit
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented engine control unit kit is designed to work with the diesel unit in the Mercedes M-Class W164 generation, in the ML320 version with the 224 HP OM642.940 engine. As a specialized Engine Control Unit, it is responsible for managing engine operation, including fuel dosing, boost control, combustion parameter monitoring, and communication with other vehicle modules.

The inclusion of a matched key in the set simplifies the adaptation process in the vehicle, as these components are factory-linked logically within the security system. Thanks to this, the set can serve as a practical base for restoring the efficiency of the powertrain after an engine electronics failure.

Compatibility with the powertrain

The set is intended for vehicles powered by diesel fuel, which means that the control logic, injection maps, and operating algorithms are adapted to the specifics of a diesel unit. Additionally, it has been configured to work with an automatic transmission, which is crucial for the correct exchange of data between the engine controller and the transmission module.

Such matching allows for maintaining the proper operating characteristics of the drive, including smooth gear shifting, appropriate response to load, and correct cooperation with driver assistance systems.

Benefits of using a used ECU kit

A used engine control unit kit with a key is a reasonable service solution in the event of damage to the original electronics. It allows for reducing repair costs while maintaining compliance with the vehicle's factory architecture. Using a component from the same model family increases the chance of a correct fit without the need for extensive installation modifications.

In practice, such a set can be particularly useful in workshops specializing in the Mercedes brand, where the ability to quickly swap the control set and perform further configuration using appropriate diagnostic software is highly valued.

Brand and product category

The product belongs to the Electronic control modules and controllers group and is dedicated to Mercedes vehicles. This means that its design, software, and communication interfaces are adapted to the brand's standards, which is important for compatibility with data buses and other modules in the vehicle.

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 ECU units, check the available parts in the Mercedes electronic control modules and controllers category.

Condition and service application

The offered set is a used item, which in practice means it comes from vehicle dismantling and can be used as a spare part in the repair process. This type of solution is often chosen in the case of advanced electronics, where a new component can be expensive, and a used element with preserved functionality allows for effectively restoring the vehicle's efficiency.

Before installation, it is recommended to verify the vehicle configuration compatibility and perform adaptation using appropriate diagnostic tools, in accordance with service procedures for engine controllers in Mercedes vehicles.

Substantive support and electronics selection

Selecting the right engine controller, especially for diesel units, requires taking into account the fuel type, transmission type, and equipment configuration. To better understand when it is worth choosing used modules and how to select them safely, it is worth reading the guide: Second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

For users of vehicles with a diesel engine, information regarding the diagnostics of the injection system and symptoms of its malfunction, described in the article Diesel injector faults – how to recognize them and what are the risks of neglecting them, may also be helpful, which facilitates a comprehensive approach to powertrain service.