BMW Mini Cooper D R55 R56 W16 1.6 Diesel ECU Kit DME CAS3 Key 7808778 Manual

BMW Mini Cooper D R55 R56 1.6 Diesel ECU DME CAS3 set with key for manual transmission is a complete engine control and immobilizer electronics package designed for Mini models with a diesel engine. The set includes the engine control unit (ECU), CAS3 module, and a matched key, which facilitates restoring the proper operation of the drivetrain after an electronics failure. This solution is particularly beneficial when replacing the entire control system in vehicles following a collision or ECU damage.

Specifications and technical data

• SKU: 7808778
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 7808778
• Substitutable numbers: 13617809794, 7809794, 13617823934, 7823934, 13617807221 13617808744 13617810909 13617808778, 7807221 7808744 7810909 7808778, 13617807808 13617808454, 7807808 7808454, 61359147191, 9147191, 0 281 012 722, 0281014295, 0 281 014 295, 61359147195, 9147195
• Fuel type: Diesel
• Gearbox type: Manual
• Category: Control Modules

Purpose and function of the ECU DME CAS3 set

The presented set belongs to the Computers and Controllers category and is dedicated to Mini Cooper D R55/R56 vehicles with a 1.6 diesel engine. The DME controller is responsible for precise management of the engine unit, while the CAS3 module handles key authorization and anti-theft security. Combining these elements into a single, synchronized set significantly simplifies the installation and configuration process in the car.

The system has been prepared for vehicles equipped with a manual transmission, which is crucial for proper compatibility with the controller software and starting logic. As a result, this set is the correct foundation for restoring full drivetrain functionality in Mini Cooper D units with a manual gearbox.

Benefits of using a complete ECU set with a key

Using a complete ECU DME + CAS3 + key package allows you to avoid the time-consuming process of matching individual modules and programming them from scratch. In practice, this means:

• consistency of the engine control and immobilizer electronics,
• reduced risk of software conflicts between modules,
• easier startup after installation compared to replacing a single controller,
• the possibility of effective vehicle repair after damage to the original ECU.

For workshops specializing in the Mini brand and for advanced users, this is a practical solution that allows for shorter diagnostic and installation times and limits the number of potential points of failure.

Technical characteristics in the context of a diesel engine and manual transmission

The set has been developed for the 1.6 Diesel unit, which means that the logic for fuel dosage, boost pressure, and accessory operation is adapted to the specifics of a diesel engine. Compatibility with a manual transmission translates into appropriate engine operating maps, load response, and handling of functions related to starting and torque cutoff.

Such matching is important both for stable idling and for the correct operation of driver assistance systems. A properly selected controller combined with the CAS3 module reduces the risk of communication errors in the vehicle network and facilitates subsequent diagnostics using service testers.

Condition, verification, and selection by part numbers

The elements included in the set come from the group of used Mini computers and controllers, which makes them an attractive cost-effective alternative to new components. Before installation, a standard diagnostic procedure in the vehicle is recommended to confirm configuration compatibility with the specific equipment version.

Selecting the right set should always be based on the OEM part number and available interchangeable numbers, as well as compatibility with the fuel type and transmission type. For a practical discussion on the topic of used control electronics – including engine controllers – the following article will be helpful: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

If you want to further deepen your knowledge about verifying component compatibility by OEM numbers and avoid mistakes when shopping online, it is worth reading this guide: Online parts shopping without risk – 5 proven ways to verify component compatibility by OEM numbers.

Expanding repairs within Mini electronics

If you are planning a comprehensive repair or upgrade of the engine control electronics area in your Mini and need other elements from the same group, such as additional controllers, management modules, or auxiliary controllers, check the available parts in the Mini Computers and Controllers category.

Summary

BMW Mini Cooper D R55 R56 1.6 Diesel ECU DME CAS3 set with key for manual transmission is a practical solution for users and service centers that need a consistent set of electronics to restore the efficiency of the drivetrain. Combining the engine controller, CAS3 module, and a matched key simplifies the installation process, reduces the number of potential immobilizer problems, and represents a rational choice when repairing Mini vehicles with a diesel engine and manual transmission.