BMW E60 E87 E90 E91 120d 320d 520d M47N2 163HP ECU Kit DDE 7803373 CAS3 + Key

BMW E60 E87 E90 E91 120d 320d 520d M47N2 163HP ECU Kit DDE 7803373 CAS3 + Key is a complete engine control set from the Electronic control modules and controllers category, designed for selected BMW models with the 163 HP M47N2 engine. The kit includes a DDE controller, a CAS3 module, and a matched key, which facilitates professional control system replacement without the need for tedious programming from scratch.

Specifications and technical data

• SKU: 7803373-1
• 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 13617801216, 7799855 7798180 780
• Category: ECUs & Computer Modules

Purpose and compatibility

The presented ECU kit is designed to work with the 163 HP M47N2 diesel engine used in popular BMW 1, 3, and 5 series models (e.g., 120d, 320d, 520d) of the E60, E87, E90, and E91 generations. Combining the DDE controller with the CAS3 module and the key ensures consistency of the immobilizer system and engine electronics, which is crucial when replacing a used controller in modern vehicles.

Thanks to the presence of dedicated interchangeable part numbers, the kit allows for selection based on a specific car configuration, taking into account hardware and software versions. This solution is particularly useful for repairs following original controller damage, CAN bus communication issues, or errors related to key authorization.

Structure of the ECU DDE + CAS3 + Key kit

The set includes the DDE engine controller, the CAS3 module responsible for ignition authorization, and a matched key. This configuration creates a coherent, factory-tuned set that, after proper adaptation to the vehicle, allows for the restoration of full starting functionality and engine operation.

Combining these elements into one package reduces the risk of incompatibility between the controller and the comfort/immobilizer module, which is often a problem when replacing individual components. For workshops, this means shorter diagnostic time, and for the user – a more predictable repair process.

Application in service practice

The ECU DDE kit with CAS3 and key is particularly useful in situations where:

• the original engine controller has suffered electrical or software damage,
• there are starting problems related to immobilizer synchronization,
• it is necessary to replace the entire control system after flooding, short circuits, or interference with the installation,
• the workshop wants to reduce the time and cost of programming from scratch by using a ready-made, matched set.

For professional services and automotive electronics technicians, such a set is a convenient solution that facilitates diagnostics, bench testing, and vehicle installation. Consistency of elements in one set reduces the number of potential failure points and speeds up the process of restoring the car's efficiency.

Condition, verification, and selection by OEM/VIN

The elements included in the set are salvaged and have a used status, which allows for economical repair while maintaining original BMW quality. Before being offered for sale, components from the Electronic control modules and controllers category are standardly checked for communication, power response, and connector integrity.

To select the correct kit for a specific vehicle, it is recommended to verify by OEM number and interchangeable numbers, as well as by VIN. This avoids hardware and software compatibility issues and minimizes the risk of needing additional coding beyond standard adaptation.

Substantive support and further reading

If you want to better understand when choosing a used controller makes sense and how to safely select a module based on OEM numbers, interchangeable numbers, and vehicle configuration, check out our guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. You will find practical tips on selection, installation, and the most frequently asked questions related to engine electronics.

Additionally, if you are interested in the broader context of using original components in repairs, it is worth reading the article Quality assurance and OEM safety – why are used original car parts the best choice for your car?, which discusses the advantages of using factory modules compared to low-quality replacements.

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 engine controllers, comfort modules, or transmission controllers, check out the available parts in the BMW electronic control modules and controllers category.