Mercedes W204 C250CDI Blue Efficiency OM651.911 204HP Engine ECU A6519007401 Key

Mercedes W204 C250CDI Blue Efficiency OM651.911 204HP Engine ECU is a specialized electronic control module designed for precise management of the powertrain in Mercedes models equipped with the OM651.911 engine. This component from the Electronic control modules and controllers category is responsible for coordinating key engine operating parameters, ensuring stable power characteristics, correct load response, and consistency with the vehicle's onboard systems. Thanks to the use of the original ECU architecture, compatibility with the factory installation and Blue Efficiency control logic is maintained.

Specifications and technical data

• SKU: A6519007401-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6519007401
• Substitutable numbers: A6519007401, A 651 900 74 01, A6519011801, A 651 901 18 01, A2079052600, A 207 905 26 00, KZ
• Color: Blue
• Category: ECUs & Computer Modules

Purpose and function of the engine controller

The presented engine ECU has been designed to work with the 204 HP OM651.911 diesel unit in the W204 generation Mercedes C-Class in the Blue Efficiency version. The module is responsible for supervising the fuel injection process, monitoring combustion parameters, and communicating with other electronic systems of the vehicle, such as safety systems or comfort systems.

Thanks to the factory design of the ECU, it is possible to maintain consistency with the original vehicle software, which translates into predictable engine behavior, correct operation under various load conditions, and stable cooperation with diagnostic systems. A properly selected controller minimizes the risk of communication errors in the CAN network and facilitates subsequent service maintenance.

Benefits of using an original ECU module

Choosing an original engine controller for the Mercedes W204 C250CDI Blue Efficiency provides a number of practical technical benefits:

• preservation of the factory control logic for the OM651.911 unit,
• correct cooperation with traction control and safety systems,
• consistency with factory diagnostic procedures,
• possibility of adaptation and configuration according to the parameters of a specific vehicle unit.

A properly selected ECU allows for maintaining stable engine performance, correct operating culture, and predictable fuel consumption within the design assumptions of the Blue Efficiency version. Electronic control modules and controllers of this type are crucial for maintaining the integrity of the entire powertrain.

Performance characteristics and installation

The offered controller belongs to the group of used electronic components, which in practice means the possibility of an economical vehicle repair while maintaining the manufacturer's original specification. The module is intended for installation in the engine compartment, in the location structurally provided for the ECU in the Mercedes W204 C250CDI.

Before installation, it is recommended to verify compatibility with the vehicle in terms of engine version and equipment configuration, and then perform appropriate adaptation procedures in the vehicle. Professional installation and configuration allow for restoring full functionality of the engine control system, without the need for interference with the electrical wiring or the mechanics of the powertrain.

Color and visual aspects

The controller housing is finished in Blue, which facilitates the identification of the component among other modules in the engine compartment or at a service station. The color does not affect the ECU's operating parameters, but it can be helpful when organizing and labeling electronic components in the workshop.

Selection of a used ECU and technical support

When choosing a used engine controller, it is particularly important to match it based on manufacturer markings, hardware and software versions, and vehicle configuration. To better understand the principles of selecting electronic modules, the differences between individual versions, and good installation practices, it is worth using the guide prepared by specialists. A detailed discussion of the topic can be found in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?, where, among other things, selection by VIN/OEM, compatibility issues, and the most frequently asked user questions are described.

If you are planning a comprehensive repair or modernization of the engine area in your Mercedes and need other elements from the same group, such as additional control modules, auxiliary controllers, or related electronic units, check the available parts in the Electronic control modules and controllers Mercedes category.