BMW 1 3 5 Series E60 E87 E90 M47N2 120d 320d 520d ECU Kit DDE CAS2 Key 7799855

BMW 1 3 5 Series E60 E87 E90 M47N2 120d 320d 520d ECU Kit DDE CAS2 Key is an original engine control unit from the Electronic control modules and controllers group, designed for BMW 1 and 3 series diesel units with the M47N2 engine. This used ECU is a solution that allows for a technically correct repair of the engine management system while maintaining the factory operating logic and parameters of the powertrain.

Specifications and technical data

• SKU: 7799855-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7799855
• Substitutable numbers: 13617808125 0281012754 61356981416, 7808125 0 281 012 754 6981416, 13617799855 13617797497 13617798187, 13617803373 13617805349 13617799317, 13617801711 13617797356 13617795845, 13617797217 13617798180 13617801216, 7799855 7797497 7798187, 7803373 7805349
• Category: ECUs & Computer Modules

Purpose and function of the ECU

The presented engine computer is dedicated to BMW E87 120d and E90 320d models with the M47N2 unit, where it is responsible for precise control of fuel injection, boost pressure, auxiliary equipment, and engine protection systems. Using an original module ensures the maintenance of the correct torque characteristics, stable idle operation, and proper cooperation with other vehicle systems, such as safety systems or body electronics. For the correct selection of the controller, it is crucial to compare the OEM part number and available interchangeable numbers – this allows for verifying compatibility with the specific vehicle configuration, software version, and engine equipment.

Benefits of using an original BMW module

The original controller from the Electronic control modules and controllers group ensures full integration with the BMW electrical architecture, which translates into:

• consistent communication via the data bus with other modules in the vehicle,
• preservation of factory injection maps and engine protection strategies,
• correct support for OBD diagnostic functions,
• stable cooperation with comfort and safety systems. A used OEM controller is also a cost-effective solution compared to a new module, while maintaining the original hardware specification and the possibility of adaptation to a specific car.

Selection by numbers and compatibility

To avoid problems with starting the vehicle, it is worth verifying the following before purchase:

• compatibility of the OEM part number with the currently installed controller,
• list of interchangeable numbers approved by the manufacturer,
• the module's belonging to the same M47N2 engine family in 120d / 320d versions. Such an approach minimizes the risk of hardware or software incompatibility and facilitates the subsequent adaptation of the controller in the vehicle, including potential coding or matching to the immobilizer.

Product condition and installation aspects

The offered engine computer is a used item, sourced from dismantling, which means it may show signs of wear that do not affect its functionality. Before installation, it is recommended to perform a standard diagnostic procedure and – depending on the specific car's requirements – carry out coding or matching at a specialized service center to ensure full cooperation with the vehicle's installation. A properly selected and correctly coded ECU restores the correct engine operation, eliminates errors related to the failure of the previous module, and allows for further, trouble-free vehicle operation.

Technical support and additional information

If you want to better understand how to safely use used electronics in a car, how to select modules by OEM numbers, and what to pay attention to during installation and diagnostics, check out the guide: Used car electronics – ECU modules and second-hand sensors. The article discusses practical examples, hardware and software compatibility issues, and the most frequently asked user questions. If you are planning a comprehensive repair or upgrade of the engine management area in your BMW and need other components from the same group, such as additional engine computers, auxiliary modules, or controllers cooperating with the powertrain, check the available parts in the BMW electronic control modules and controllers category.