BMW E60 E87 E90 120d 320d 520d M47N2 Engine Control ECU Kit DDE 7803373 CAS3

BMW E60 E87 E90 120d 320d 520d M47N2 Engine Control ECU Kit CAS3 is a complete, used set from the Electronic control modules and ECUs category, designed for advanced engine management in selected BMW models equipped with the M47N2 engine. This is a solution for users who expect factory integration, stable system operation, and compatibility with the vehicle's electronic architecture.

Specifications and technical data

• SKU: 7803373-6
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7803373
• Substitutable numbers: 13617803373, 7803373, 13617808125, 7808125, 13617797497 13617798187 13617805349 13617799317, 7797497 7798187 7805349 7799317, 13617801711 13617797356 13617795845 13617797217, 7801711 7797356 7795845 7797217, 13617799855 13617798180, 61356943834, 6943834, 0281013501
• Category: ECUs & Computer Modules

Purpose and function of the engine control kit

The presented engine control kit is dedicated to BMW 1, 3, and 5 series models with the M47N2 unit, such as the 120d, 320d, or 520d, based on the E60, E87, and E90 platforms. The kit includes components responsible for coordinating engine operation, communicating with the CAS3 immobilizer, and interacting with other onboard modules.

In practice, this means the system manages, among other things, fuel dosing, ignition timing in the diesel engine, communication with security systems, and data exchange within the vehicle's bus. This ensures the consistency of the electronic configuration and the proper functioning of comfort and safety features.

Benefits of using an original BMW kit

Using an original BMW engine control kit provides:

• Full integration with the factory electrical installation – modules are designed for a specific vehicle architecture, which reduces the risk of communication errors.
• Consistency with the CAS3 system – proper cooperation with the immobilizer and starting system, without the need for universal solutions.
• Ability to maintain original vehicle functions – including communication with other powertrain and comfort control units.
• Easier diagnostics – the modules are fully supported by factory BMW service tools, which facilitates configuration and potential coding.

For workshops and users, this means a more predictable installation process and a lower risk of software compatibility issues.

Technical characteristics and compatibility

As an item from the Electronic control modules and ECUs category, the kit has been designed to operate in the demanding environment of the engine bay and vehicle interior, taking into account thermal loads and electromagnetic interference. The module design incorporates manufacturer standards regarding vibration resistance and signal stability.

The product has a dedicated OEM part number and an extensive list of interchangeable numbers, which makes it easier to select the right controller for a specific car configuration. When selecting, it is recommended to verify compatibility by the OEM number and compare the hardware and software versions with the currently installed controller to ensure proper cooperation with other vehicle systems.

Condition, installation, and service recommendations

The kit is used, which in practice allows for an economical repair or replacement of a damaged controller while maintaining the manufacturer's original specifications. Before installation, a standard visual inspection of connectors and the housing, as well as diagnostics after installation in the vehicle, is recommended.

In most cases, proper coding or adaptation of the kit to a specific BMW vehicle is required, using specialized service software. Correct installation and configuration allow for the restoration of full powertrain functionality, including proper starting, stable engine operation, and communication with safety systems.

Technical support and practical knowledge

If you want to better understand how to safely select and install used engine controllers and other ECU modules, it is worth using practical tips prepared by specialists. Detailed information regarding selection by OEM number, hardware and software compatibility, and frequently asked questions can be found in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.

Additionally, if you are considering a broader service strategy and want to compare the advantages of new and used parts in terms of costs and durability, the guide Car parts – new or used? We compare costs, quality, and durability, which discusses the practical aspects of choosing components, will be helpful.

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 controllers, ECU modules, or CAS units, check out the available parts in the BMW electronic control modules and ECUs category.