BMW E81 E87 LCI 123d Petrol N47S 204HP ECU Kit DDE 8506442 + CAS3 + Key Manual

BMW E81 E87 LCI 123d Petrol N47S 204HP ECU Kit DDE + CAS3 + Key Manual is a complete engine control kit designed for BMW 1 Series LCI models equipped with the N47S engine and a manual transmission. The set includes the DDE engine control unit, the CAS3 module, and a matched key, facilitating seamless integration with the vehicle's electronics. This is a practical solution for workshops and users looking for a reliable, used ECU kit for professional repair or replacement.

Specifications and technical data

• SKU: 8506442-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8506442
• Substitutable numbers: 13618518168, 8518168, 13617823425, 7823425, 13617823424, 7823424, 13617812539, 7812539, 13618506442, 8506442, 13618506441, 8506441, 13618507245, 8507245, 13618512500, 8512500, 13618510593, 8510593, 0281016114, 0 281 016 114, 61359217853, 9217853, KZ
• Fuel type: Petrol
• Gearbox type: Manual
• ECU type: Engine Control Unit
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented kit belongs to the Electronic control modules and ECUs category and plays a key role in managing engine performance in the BMW 1 Series E81/E87 LCI with the 204 HP N47S engine. The DDE controller is responsible for precise fuel metering, ignition control, engine accessory operation, and communication with other vehicle systems. Integrating it with the CAS3 module and the key ensures system security consistency and facilitates adaptation in the vehicle.

Kit construction and benefits of a complete configuration

The set includes the Engine Control Unit, the CAS3 module, and a key matched to this set. As a result, the user receives a configured package that minimizes the risk of issues with the immobilizer and communication between controllers. This configuration is particularly valuable when replacing a damaged ECU, where maintaining compatibility with the vehicle's start system and comfort electronics is necessary.

Combining the engine controller with the CAS3 module in one set promotes more efficient workshop operations – it reduces the number of additional programming steps required and allows for faster restoration of full vehicle functionality. This is a technically coherent solution that fits well with the requirements of modern BMW electronic systems.

Drivetrain compatibility

The offered set has been prepared for vehicles powered by petrol and equipped with a manual transmission. Using the correct type of ECU for a specific drivetrain configuration is essential for proper engine operation, smooth acceleration, and interaction with safety and comfort systems. Selecting the right control kit reduces the risk of communication errors in the vehicle network and facilitates future diagnostics.

Practical service application

This used ECU kit is suitable both for replacing a damaged controller and for more advanced engine electronics repairs in the BMW 1 Series. The complete package with CAS3 and key allows for shorter service times while ensuring the consistency of the security system. This solution is particularly useful for workshops specializing in the BMW brand that require compatible, original control modules.

To better understand when choosing a used engine controller is cost-effective and how to safely select such a kit for a specific car, it is worth reading our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

Expanding the BMW control system

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as additional controllers, engine management modules, or related electronic systems, check out the available parts in the BMW electronic control modules and ECUs category.