Mercedes W204 C200 CDI BlueEFFICIENCY 651.913 136HP ECU Kit A6519007500 Key Lock

Mercedes W204 C200 CDI BlueEFFICIENCY 651.913 136HP ECU Kit Key Lock is a complete set from the Electronic control modules and controllers group, designed for the C200 CDI BlueEFFICIENCY diesel engine version. The set is matched to the 651.913 unit with 136HP and works with a manual transmission, allowing for consistent control of the drivetrain and associated systems.

Specifications and technical data

• SKU: A6519007500-9
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6519007500
• Substitutable numbers: A6519007500, A 651 900 75 00, A0064461540, A 006 446 15 40, A2045458132, A 204 545 81 32, A2079057101, A 207 905 71 01, A6461509372
• Fuel type: Diesel
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented control set is dedicated to the diesel drivetrain in the Mercedes C-Class W204 generation, specifically the C200 CDI BlueEFFICIENCY version with the 651.913 engine. It is responsible for managing engine operating parameters, such as fuel dosage, boost pressure, and injection corrections, as well as communicating with other vehicle systems.

Thanks to being tuned for a specific engine configuration and manual transmission, the set ensures consistent drivetrain operation, stable torque characteristics, and predictable throttle response. This solution allows for maintaining the factory control logic and operating characteristics of the C200 CDI unit.

Benefits of using an original ECU kit

Using a complete engine control unit set with a steering lock and key helps reduce issues with matching electronics and the immobilizer. In practice, this translates into:

• maintaining the factory operating characteristics of the diesel engine,
• consistency of communication within the vehicle network,
• reduced risk of errors associated with incompatible modules,
• easier configuration compared to mixing different controllers.

For users who value drivetrain stability and compliance with factory settings, such a set is a practical solution when replacing a damaged controller or performing engine electronics repairs.

Application in a diesel drivetrain with a manual transmission

The BlueEFFICIENCY diesel engine requires precise control to maintain the right balance between dynamics and fuel consumption. The ECU kit prepared for use with a manual transmission takes into account the specifics of power transmission, including torque delivery and response to gear changes.

In practice, this means that the controller is configured for:

• diesel operating characteristics in the low and mid-RPM range,
• handling functions related to BlueEFFICIENCY efficiency,
• communication with modules responsible for safety and driving comfort.

Such matching promotes maintaining predictable vehicle behavior after replacing electronics, without the need for non-standard modifications.

Characteristics of the used product

The offered ECU kit with lock and key is a used item, which means it comes from vehicle dismantling and may show signs of wear typical for this type of part. For many users, this represents a favorable compromise between repair costs and maintaining original Mercedes electronics.

Choosing a used set from the Electronic control modules and controllers group is particularly attractive for repairs where compliance with the factory vehicle architecture and cost reduction while maintaining proper functionality are key.

Related categories and technical materials

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, comfort modules, or transmission control units, check the available parts in the Mercedes electronic control modules and controllers category.

For a comparison of how manufacturers approach electronics and maintain brand character, it is worth reading an article describing how original modules affect vehicle properties – you can find it here: Audi and pure emotion – how used modules and controllers help maintain the brand's DNA.

If you are interested in a broader context of selecting used electronic and mechanical components in popular car models, our guide may also be helpful: The best used car parts – a guide to the most frequently chosen original parts.