BMW E81 E87 LCI E90 E91 120d 320d Diesel N47 ECU Kit DDE 7810000 CAS3 + Key

BMW E81 E87 LCI E90 E91 120d 320d Diesel N47 ECU Kit DDE CAS3 + Key is a complete control kit designed for N47 diesel engines in selected BMW 1 and 3 Series models. The set includes the DDE engine control unit, the CAS3 module, and a matched key, which facilitates restoring the electronic system's functionality after a failure or engine replacement. This solution allows for consistent management of the powertrain electronics and immobilizer in one compatible package.

Specifications and technical data

• SKU: 7810000-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7810000
• Substitutable numbers: 13618512587 13617810000 0281015075 61359147196, 8512587, 7810000, 0 281 015 075, 9147196
• Fuel type: Diesel
• Category: ECUs & Computer Modules

Application and function of the ECU DDE CAS3 + Key kit

The presented kit belongs to the Electronic control modules and ECUs category, designed to work with the N47 diesel engine in BMW 120d and 320d models. Combining the DDE controller with the CAS3 module and the key ensures consistent operation of the fuel injection system, starting system, and vehicle security, minimizing the risk of compatibility issues between individual components.

A set of this type is particularly useful for:

• replacing a damaged engine control unit in vehicles with an N47 diesel engine,
• swapping a powertrain unit along with its electronic accessories,
• resolving communication issues between the engine control unit and the CAS3 module.

Benefits of using the complete DDE + CAS3 + Key kit

Combining the DDE controller, CAS3 module, and key in one package reduces the need to program the entire security system from scratch. Component consistency facilitates the work of electricians and diagnosticians, shortens installation time, and reduces the risk of software incompatibility or key authorization problems.

Key advantages of this solution include:

• kit completeness – the engine control unit, CAS3 module, and key come from a single system,
• easier integration with the vehicle's wiring due to the preserved logic of component interaction,
• the ability to effectively repair the vehicle after an engine electronics or immobilizer system failure.

Technical characteristics in the context of the N47 diesel engine

The kit has been developed to work with the N47 diesel unit, which means it is adapted to the specifics of high-pressure injection, boost control, and advanced engine operating strategies. The DDE controller is responsible for precise management of engine performance parameters, while the CAS3 module controls key authorization and the starting process, creating a coherent security and control system.

In practice, this means that with proper selection for a specific vehicle version, you can achieve:

• stable engine operation across the full load range,
• correct operation of the start/stop function (if present in the car's configuration),
• preservation of factory anti-theft security based on the interaction between the CAS3 and the key.

Condition, verification, and selection by OEM/VIN

The offered kit comes from a used vehicle, which is a common solution in the automotive electronics segment, especially for engine control units and comfort modules. Before installation, it is recommended to verify compatibility by OEM number or the vehicle's VIN to match the hardware and software version to the specific car configuration.

If you want to learn more about selecting and installing used controllers, how to check HW/SW compatibility, and practical aspects of installation, check out our guide: Used automotive electronics – second-hand ECU modules and sensors.

Expanding the BMW control system – related modules

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

This allows you to build a coherent powertrain and body electronics set based on components designed for a specific brand and fuel type, which facilitates diagnostics, service, and subsequent vehicle operation.