Mercedes W204 C250 BlueEFFICIENCY M274.911 Engine ECU Kit A2749000700 Key Lock

Mercedes W204 C250 BlueEFFICIENCY M274.911 Engine ECU Kit Key Lock is a solution designed for vehicles with an automatic transmission and a diesel engine. The set comes from the Electronic control modules and ECUs group, which ensures component consistency and facilitates the restoration of full powertrain functionality. It is a practical option for workshops and users looking for a complete, matched engine electronics package.

Specifications and technical data

• SKU: A2749000700-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2749000700
• Substitutable numbers: A2749000700, A 274 900 07 00, 0261S06039, 0 261 S06 039, A2079057101, A 207 905 71 01
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and configuration of the set

The presented ECU set is dedicated to the Mercedes C-Class W204 generation, C250 BlueEFFICIENCY version with the M274.911 unit. The set includes an electronic engine control unit along with steering lock components and a key, which allows for maintaining immobilizer system consistency and comfortable vehicle starting after installation.

The solution is prepared for vehicles with a diesel engine and an automatic transmission, ensuring the ECU works with the factory gear-shifting logic and driver assistance systems.

Key technical advantages

Using a complete ECU set with a lock and key significantly simplifies the repair or replacement process of engine electronics. In one package, you receive:

• a consistent engine control unit matched to the M274.911 unit,
• integrated vehicle security system components,
• compatibility with the automatic transmission in the given model.

This minimizes the risk of issues with software matching, immobilizer synchronization, or communication with other modules in the vehicle. This is particularly important in modern powertrains, where the engine control unit works with many safety and comfort systems.

Application in vehicles with a diesel engine and automatic transmission

In vehicles with a diesel engine, the ECU is responsible for precise control of fuel dosage, boost pressure, fuel injection system operation, and cooperation with exhaust gas treatment systems. The version intended for an automatic transmission additionally communicates with the transmission module, affecting the smoothness of gear changes and the overall refinement of the powertrain.

Selecting the correct controller for a specific powertrain configuration is crucial for engine stability, proper operation of BlueEFFICIENCY functions, and maintaining factory performance and fuel consumption parameters.

Professional application and selection of used electronics

A used ECU set with a key and steering lock is a solution often chosen by professional service centers that want to reduce repair time and costs compared to purchasing a new module. With proper selection for a specific vehicle, you can achieve stable, repeatable powertrain operation without the need for extensive installation modifications.

If you want to better understand when choosing a used engine control unit is justified and what to pay attention to when matching electronics, it is worth checking out the guide: The second life of electronics – when is it worth choosing used engine ECUs, comfort modules, and parking sensors?.

Expanding work in the area of Mercedes engine electronics

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 additional controllers, engine management modules, or related controllers, check the available parts in the Mercedes electronic control modules and ECUs category.

To compare the advantages of original components versus replacements, you can also use our practical study: 5 reasons why a used OEM part is a better choice than a replacement, which will help you make an informed purchasing decision for future repairs.