BMW E81 E87 E90 N43 120i 320i N43 170HP ECU Kit DME CAS3 Key 7583225 Manual

BMW E81 E87 E90 N43 120i 320i ECU Kit DME CAS3 Key is a complete engine control unit kit for manual transmission, designed for selected BMW 1 and 3 series models with the 170HP N43 engine. The kit includes the DME module, CAS3 module, and a matched key, which facilitates professional control system replacement without the need for time-consuming programming from scratch. With this solution, you can restore full drivetrain functionality in a consistent and technically correct manner.

Specifications and technical data

• SKU: 7583225-13
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7583225
• Substitutable numbers: 7583225, 12147583225, 7599881, 12147599881, 7507228, 12147507228, 7580279, 12147580279, 7593667, 12147593667, 7575668, 12147575668, 7579144, 12147579144, 7599882, 12147599882, 7583227, 12147583227, 5WK93643, 61359147195, 9147195, 61359147199, 9147199, 61356943830, 6943830, 12147579142, 7579142, 12147585303, 7585303, 12147575665, 7575665
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Application and compatibility with the N43 engine

The presented ECU kit has been developed for the 170HP N43 petrol engine, used in BMW 1 Series E81/E87 and 3 Series E90 models in 120i and 320i versions. Combining the DME controller with the CAS3 module and key ensures immobilizer data consistency, which is crucial when replacing electronics in modern petrol units. This solution allows for maintaining proper communication between the engine controller, security system, and vehicle wiring.

Construction of the ECU DME CAS3 Key kit

The kit belongs to the Electronic control modules and controllers group, covering components responsible for engine management and start authorization. The DME module is responsible for precise control of the petrol unit's operating parameters, while the CAS3 integrates immobilizer functions and key handling. The presence of a matched key significantly simplifies the installation process and reduces the risk of issues with vehicle start system synchronization.

Benefits of using a complete kit

Choosing a complete ECU kit with DME, CAS3, and key is a particularly beneficial solution for major engine electronics failures or immobilizer problems. Instead of selecting and programming each module separately, you receive a pre-matched set that:

• minimizes the risk of conflicts between the engine controller and the CAS module,
• facilitates starting the petrol unit after electronics replacement,
• reduces workshop time for diagnostics and installation,
• allows for maintaining the consistency of the vehicle's security system.

For cars with a manual transmission, this means stable cooperation of the drivetrain with the control electronics, without the need for additional software modifications for a different type of gearbox.

Characteristics of operation with a petrol engine and manual transmission

The kit has been prepared for use with a petrol engine, which is significant for injection maps, ignition, and the operating strategy of the N43 unit. The appropriate DME controller software ensures correct management of the mixture, ignition, and diagnostics specific to this unit. Additionally, the configuration for a manual transmission guarantees proper handling of signals related to clutch position, start logic, and load response during gear changes.

Condition, verification, and practical application

The components included in the kit are sourced from dismantling and are intended for reinstallation in BMW vehicles that have experienced engine controller failure or issues with the CAS3 module. This type of kit is particularly useful in specialized workshops dealing with BMW electronics, where the ability to quickly restore vehicle functionality while maintaining factory system logic is essential.

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other components from the same group, such as additional controllers, comfort modules, or engine management systems, check the available parts in the BMW electronic control modules and controllers category.

Substantive support and knowledge about BMW electronics

When working with advanced electronics, such as the engine controller or CAS3 module, it is worth using reliable sources of knowledge. If you want to better understand the principles of controller operation in BMW 3 and 5 series, as well as the practical aspects of using parts from dismantling, read the article Joy of driving for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using parts from dismantling?. This will help you plan proper diagnostics and component selection more easily.