BMW E60 E87 E90 LCI N47 120d 320d ECU Control Unit Kit DDE 7823420 CAS3 Key

BMW E87 E90 N47 120d 320d Engine Computer 7823420 is an original electronic engine control unit designed for BMW diesel engines with automatic transmissions. This item from the Electronic Control Modules and Controllers group is responsible for precise engine operation management, fuel injection, and cooperation with the automatic gearbox. Thanks to its factory design, the ECU ensures compatibility with the electrical architecture of BMW 1 Series E87 and 3 Series E90 vehicles with the N47 engine.

Specifications and technical data

• SKU: 7823420-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7823420
• Substitutable numbers: 13618512498, 8512498, 13617812538, 7812538, 13618506437, 8506437, 13618510591, 8510591, 13617823421, 7823421, 13618506374, 8506374, 13617823420, 7823420, 13618506438, 8506438, 0281014572, 0 281 014 572, 61359147226, 9147226
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and Function of the BMW N47 Engine Controller

The presented engine computer is dedicated to Diesel powertrains in BMW 120d and 320d models with the N47 engine, working with an automatic transmission. The controller manages key engine operating parameters such as fuel dose, boost pressure, cold start strategy, and communication with other modules in the vehicle (including the automatic gearbox, traction control system, comfort module). A correctly selected ECU allows for maintaining factory performance, smooth operation, and compliance with safety systems.

Compatibility and Replacement Numbers

This BMW engine computer belongs to a family of controllers widely used in N47 units, meaning a wide range of reference and replacement numbers are available within the same hardware and software group. The presence of an extensive list of interchangeable numbers facilitates the selection of the appropriate module based on the specific vehicle configuration, power version, and year of manufacture. When matching the controller, it is recommended to verify compatibility by OEM number, reference numbers, and engine and gearbox configuration, as well as to consider the adaptation or programming procedure for the specific car.

Performance Characteristics and Benefits of Using a BMW ECU

The factory BMW engine computer ensures consistency with the manufacturer's original software, which translates to stable engine operation and correct cooperation with OBD diagnostic systems. Using a controller from the same family as the factory part allows for:

• maintaining correct injection and boost maps for the N47 engine,
• preserving compatibility with the automatic transmission and its gear shifting logic,
• limiting the risk of communication errors in the vehicle's CAN network,
• facilitating service and diagnostics in authorized and independent workshops.

This makes the controller a practical solution for both repairs after ECU failure and for replacing a damaged module in vehicles used daily.

Condition, Installation, and Technical Aspects

The offered BMW engine computer comes from the used electronic control modules circulation, which helps reduce repair costs while maintaining original hardware specifications. Before installation, standard workshop procedures should be anticipated, such as software adaptation to the specific vehicle (coding, potential programming or data cloning) and verification of the electrical system for previous faults. Installation in a specialized service center with appropriate diagnostic equipment for working with BMW ECUs is recommended.

Technical Support and Selection of a Used ECU

When choosing a used engine controller, correct matching by OEM number, replacement numbers, and engine and gearbox configuration is crucial. A detailed discussion of selection principles, hardware and software compatibility issues, as well as practical installation examples can be found in the Global Parts guide: Used Car Electronics Onboard – Why Choose Second-Hand ECU Modules and Sensors?. This is a valuable source of knowledge for mechanics and users planning a conscious purchase of a used controller.

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 transmission controllers, check the available parts in the BMW Electronic Control Modules and Controllers category.