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

The BMW E87 E90 M47N2 120d 320d ECU Computer 7799855 is an original engine control unit from the Electronic Control Modules and Controllers group, designed for use in selected BMW models with the M47N2 engine. This is a solution for users who need a reliable ECU computer for professional repair or to restore full powertrain functionality in the 1 and 3 Series.

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

ECU Controller Purpose and Function

The presented engine computer is responsible for precise control of the M47N2 diesel engine in BMW E87 120d and E90 320d models. The module manages, among other things, fuel delivery, the injection system, combustion parameter control, and communication with other vehicle electronic systems. A correctly selected and functional ECU is crucial for stable engine operation, proper power output, smooth running, and reduced fuel consumption.

As a component from the Electronic Control Modules and Controllers group, this computer is an integral part of BMW's electronic architecture, communicating with the vehicle's wiring, sensors, and other comfort and safety modules.

Benefits of Using an Original BMW Controller

Using an original BMW ECU controller to replace a damaged or malfunctioning module allows for the restoration of factory engine operating parameters. In practice, this means:

• stable cold and warm starts,
• correct throttle response,
• maintenance of proper combustion parameters,
• reduced risk of the engine entering limp mode,
• better communication with other vehicle electronic systems.

For workshops and individual users, this means the ability to perform a professional engine control system repair without the need for aftermarket parts with uncertain specifications.

Integration with BMW 1 and 3 Series Electronics

The ECU computer designed for the M47N2 engine in BMW E87 120d and E90 320d is engineered for seamless integration with the vehicle's communication bus. A correctly selected module:

• enables proper communication with BMW diagnostic testers,
• works with factory safety and comfort systems,
• allows for adaptations and coding according to manufacturer service procedures.

This makes the controller a solid foundation for further vehicle configuration – whether for a standard replacement or more advanced electronic service work.

Product Condition and Application in Repairs

The offered BMW engine controller is a used part from disassembly, making it an attractive cost-effective solution while maintaining original manufacturer specifications. This type of module is particularly useful in situations where the existing computer has been damaged due to overvoltage, water ingress, or internal electronic failure.

Before installation, it is recommended to perform a full vehicle diagnosis and plan appropriate programming procedures and potential driver adaptation to the specific vehicle, in accordance with BMW service practices.

More About BMW Electronics and Used Parts

If you want to better understand how to properly service BMW engine controllers and other electronic modules, as well as how to safely use used parts in the 3 and 5 Series, consult the guide: Years of Driving Pleasure – How to Care for iDrive Systems and Electronic Modules in BMW 3 and 5 Series Models Using Used Parts?. This is a practical source of knowledge for users and workshops working with BMW electronics.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as engine controllers, comfort modules, or other electronic control units, check the available parts in the BMW Electronic Control Modules and Controllers category.