Mercedes A207 Engine Control ECU 3.0 CDI 265HP E350 KIT Automatic A6421508900

Mercedes A207 Engine Control ECU 3.0 CDI 265HP E350 KIT Automatic is a complete electronic control module designed for Mercedes powertrains with a 3.0 CDI engine and an automatic transmission. The kit comes from a vehicle dismantling process, which allows for an economical yet technically sound repair of the engine and transmission control system. This solution is intended for users who expect component consistency and stable operation of the powertrain electronics.

Specifications and technical data

• SKU: A6421508900-13
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421508900
• Substitutable numbers: A2045458132-2, A6421508900, A 642 150 89 00, 0281016656, 0 281 016 656, A2079057101, A 207 905 71 01, A2127664006, A 212 766 40 06
• Gearbox type: Automatic
• Part type: Engine Control Unit (ECU)
• Category: ECUs & Computer Modules

Purpose and function of the control kit

The presented kit belongs to the Electronic control modules and ECUs category and is dedicated to Mercedes E-Class models in the A207 version with a 3.0 CDI engine producing 265 HP, working in conjunction with an automatic transmission. Its task is to precisely manage the operation of the power unit and communication with other vehicle systems, such as the transmission, safety systems, or comfort features. The engine computer in this kit is responsible for:

• monitoring the operating parameters of the CDI diesel engine,
• cooperation with the automatic transmission regarding gear shift strategies,
• communication with other controllers in the vehicle via data buses,
• handling diagnostic functions and error logging.

Compatibility and replacement numbers

The kit has been designed as an original Mercedes component, with an assigned OEM part number and available interchangeable numbers. This makes it possible to match the controller to a specific vehicle configuration while maintaining compliance with factory software and electrical architecture. The presence of multiple reference numbers increases the chance of correctly selecting the module for a specific car, which is particularly important when repairing modern electronic systems. Before purchasing, it is recommended to compare the markings with the currently installed controller or seek professional assistance.

Integration with the automatic transmission

The product is intended for vehicles equipped with an automatic transmission, which is crucial for the proper operation of the entire powertrain. Correct matching of the controller to the transmission type allows for:

• smooth and predictable gear shifts,
• proper cooperation with driving modes (comfort, sport, etc., if available in the specific configuration),
• maintaining factory engine and transmission protection strategies,
• efficient operation of diagnostic functions related to the transmission. As a result, this kit can be used both for repairs following an electronics failure and for replacing a damaged computer with a verified component from a dismantled vehicle.

Characteristics of the used product

The offered module is marked as a used product, which in practice means it comes from an operated vehicle but has been verified for suitability for further installation. This type of solution allows for a significant reduction in repair costs compared to new components, while maintaining the manufacturer's original specifications. In the case of automotive electronics, it is important to use components from the same family of controllers with compatible markings and parameters. Using an original module from a dismantled vehicle facilitates adaptation in the vehicle, coding, and potential software updates at a service center.

Technical support and controller selection

When selecting an engine controller and related modules, it is worth using the knowledge of specialists dealing with vehicle electronics. Educational materials regarding the operation of control modules in other brands, e.g., BMW, can also be helpful – the principles of diagnosis, coding, and adaptation are often similar. In this context, it is worth reading an article describing a practical approach to repairing iDrive systems and engine controllers in the 3 and 5 series: how to take care of iDrive systems and electronic modules in BMW using parts from dismantling. For users interested in a broader approach to the operation and servicing of Mercedes power units, material dedicated to maintaining engine accessories in popular C-Class and E-Class models may also be helpful: how to take care of Mercedes-Benz C-Class and E-Class engine accessories. It allows for a better understanding of the importance of functional control modules in the entire powertrain.

Related Mercedes Electronic control modules and ECUs

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