BMW E90 E91 LCI 320d N47N 184HP ECU KIT DDE + CAS3 + Key 8512047 Manual

BMW E90 E91 LCI 320d N47N 184HP ECU KIT DDE + CAS3 + Key is a factory ECU module from the Electronic control modules and controllers group, designed for BMW diesel units with a manual transmission. It offers stable engine management, ensuring proper control of injection, boost, and engine protection. This is a solution for users looking for proven, used electronics with preserved functionality.

Specifications and technical data

• SKU: 8512047-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8512047
• Substitutable numbers: 8512047, 13618512047, 8519668, 13618519668, 8518269, 13618518269
• Fuel type: Diesel
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the controller

The presented engine control unit is dedicated to the N47N diesel engine with 184 HP in post-facelift BMW 3 Series models (E90/E91 LCI) with a manual gearbox. As the central ECU, it is responsible for precise management of engine operating parameters, such as fuel dosage, boost pressure, starting system operation, and protective strategies in emergency modes. Thanks to this, the vehicle maintains stable performance, proper operating culture, and compliance with factory control maps.

Benefits of using an original BMW module

Using an original BMW controller to replace a damaged or unstable module allows for the restoration of the engine's factory operating characteristics. In practice, this means:

• consistent operation of all systems related to the engine (injection, boost, OBD diagnostics),
• proper cooperation with the electrical installation and other modules in the vehicle,
• possibility of further diagnostics and programming using standard BMW service tools,
• maintenance of factory safety and engine protection strategies.

For workshops and users, this means a lower risk of compatibility issues and easier configuration during the adaptation of the controller to a specific car.

Application in a diesel powertrain with a manual transmission

The controller has been designed to work with a diesel engine and a manual transmission, which is important for torque control logic, start assist functions, idle speed control, and load response. The appropriate maps and control algorithms are adapted to the characteristics of the N47N unit, which translates into predictable vehicle behavior across the full range of RPM and loads.

Product condition and installation aspects

The module comes from the secondary market, which allows for reduced repair costs while maintaining the factory design and connectors. Before installation, it is recommended to verify compatibility by the OEM number and interchangeable numbers, as well as to prepare a procedure for programming or matching to a specific vehicle (coding, potential assignment to the immobilizer in accordance with the service procedure). A correctly selected and configured controller allows for the restoration of full powertrain functionality without the need for interference with the electrical harness.

Choosing a used ECU and technical knowledge

When choosing a used engine computer, it is crucial to check compatibility by numbers and match it according to the software version and vehicle equipment. A detailed discussion of selection principles, including working with OEM and reference numbers, as well as practical examples of installation and adaptation, can be found in the Global Parts guide: Used automotive electronics – second-hand ECU modules and sensors. This is a valuable source of knowledge for mechanics and informed users planning a controller replacement.

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 control modules, auxiliary controllers, or electronic management units, check the available parts in the BMW electronic control modules and controllers category.