Mercedes C204 C250CDI 651.911 Engine ECU Kit A6519007500 Ignition + 2 Keys

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes C204 C250CDI 651.911 Engine ECU Kit Ignition + 2 Keys is a complete engine control set designed for the diesel unit in the C-Class C204 model. It includes the engine control unit, ignition switch component, and two keys, which facilitates a consistent, professional replacement of the vehicle's control electronics. By maintaining component compatibility, the set allows for the efficient restoration of full powertrain functionality.

Specifications and technical data

• SKU: A6519007500-22
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6519007500
• Substitutable numbers: A6519007500, A 651 900 75 00, A0064461540, A 006 446 15 40
• Fuel type: Diesel
• Gearbox type: Manual
• ECU type: Engine Control Unit
• Category: ECUs & Computer Modules

Application and function of the ECU kit

The presented set belongs to the Electronic control modules and ECUs category and plays a key role in managing the operation of the diesel engine. The engine control unit is responsible for precise fuel dosing, boost pressure control, fuel injection system operation, and cooperation with other vehicle systems. Integrating it with the ignition module and two keys minimizes the risk of immobilizer issues and simplifies vehicle configuration after installation.

Compatibility with Diesel engine and manual transmission

The set has been prepared for use with a Diesel power unit, which means that injection maps, starting strategies, and operating parameters are adapted to the characteristics of a diesel engine. Its design for a vehicle with a manual transmission ensures proper handling of signals related to clutch position, engine speed, and load, which translates into stable, predictable powertrain operation.

Kit construction and benefits of a complete replacement

The set includes the Engine Control Unit along with the ignition switch component and two keys, which allows for maintaining the consistency of the vehicle's security system. This configuration limits the need for additional immobilizer programming and reduces the risk of incompatibility between individual modules. For workshops and users, this means shorter installation time and a lower probability of communication errors within the vehicle network.

Characteristics of the used product

The components included in the set come from the secondary market, which represents a reasonable compromise between repair costs and maintaining the manufacturer's original specifications. Used engine control units and related components are frequently chosen by professional service centers as a solution that allows for an economical, yet technically correct, repair of the electronic system. Proper selection based on the model, engine type, and transmission is crucial for trouble-free operation after installation.

Selection and safety of using used electronics

When choosing a used ECU kit, it is important to match it to the specific vehicle configuration, including fuel type, transmission type, and electrical system architecture. Using a complete set with keys and an ignition switch reduces the number of variables in the installation process and facilitates the diagnosis of potential faults. For users, this means greater predictability of the repair outcome and the ability to maintain the factory logic of driver assistance systems.

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, power unit management modules, or electronic controllers working with the ECU, check the available parts in the Mercedes electronic control modules and ECUs category.

To better assess when choosing a used engine control unit set is technically and economically justified, it is worth reading the guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?