BMW 1 3 Series E81 E87 E90 120i 320i N43 ECU Kit DME 7580279 CAS3 Keys Automatic

BMW 1 3 Series E81 E87 E90 120i 320i N43 ECU Kit DME CAS3 Keys Automatic is a practical solution for workshops and users looking to efficiently restore full functionality to their powertrain electronics. The set belongs to the Electronic control modules and ECUs category, which ensures component consistency and facilitates integration with the vehicle's factory installation. Thanks to its completeness (DME, CAS3, keys), it minimizes the risk of issues with the immobilizer and inter-module communication.

Specifications and technical data

• SKU: 7580279-6
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7580279
• Substitutable numbers: 12147599881, 12147580279, 5WK93637, 61356943834, 6943834
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and compatibility

The presented BMW 1 3 Series E81 E87 E90 120i 320i N43 ECU Kit DME CAS3 Keys Automatic is designed for BMW 1 Series E81/E87 and BMW 3 Series E90 models equipped with the N43 petrol engine and an automatic transmission. This configuration allows for maintaining compatibility with the vehicle's factory electronic architecture, including security systems and CAN bus communication.

The set includes components that work together from the factory, which reduces the need for time-consuming adaptation and programming from scratch. This is particularly important when replacing the ECU in vehicles where correct cooperation between the engine control unit, the CAS module, and the vehicle key is crucial.

Set composition and function of individual elements

The set includes an electronic DME engine control unit responsible for managing the N43 unit, a CAS3 module that handles start authorization functions, and matched keys. This configuration creates a coherent system in which:

• the DME controller is responsible for injection and ignition strategy,
• the CAS3 module handles the immobilizer and key authorization,
• the keys are synchronized with the CAS3, which enables vehicle starting.

Thanks to this set, you can systematically recreate the original logic of the powertrain system without the need to source individual modules from different origins.

Benefits of using a complete ECU DME + CAS3 + keys set

Using a complete powertrain electronics set in a BMW with an N43 engine and automatic transmission brings measurable service and operational benefits. The most important include:

• software consistency between the engine controller and the CAS3 module,
• reduced risk of immobilizer conflicts and communication errors,
• reduction in time required for programming and matching components,
• possibility of effective vehicle repair after engine electronics failure or start authorization issues.

For workshops specializing in the BMW brand, such a set is a convenient solution that allows them to focus on correct installation and road testing, rather than long-term coding of individual modules.

Characteristics of working with a petrol engine and automatic transmission

The system has been designed to work with the N43 petrol engine, which means the control maps are adapted to the specifics of this unit. At the same time, the configuration is prepared to work with an automatic transmission, which is important for the correct data exchange between the engine controller and the transmission control unit.

Such a combination ensures smooth gear shifting, proper response to load, and stable operation at idle and during acceleration. For the user, this means maintaining driving characteristics close to factory standards while utilizing a used, yet functional, electronics set.

Condition, origin, and installation aspects

The elements included in the set come from dismantling and are offered as used original BMW components. This type of solution is often chosen by professional service centers when they want to maintain the factory logic of system operation while optimizing repair costs.

During installation, it is recommended to perform standard diagnostic procedures, including verifying communication within the vehicle network and checking the correct operation of the immobilizer after installation. In many cases, such a set allows for significantly shortening the time required to restore the vehicle's efficiency after damage to the powertrain electronics.

If you are planning a comprehensive repair or upgrade of the engine control and start security area in your BMW and need other elements 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 ECUs category.

To compare different manufacturers' approaches to original electronic modules and the importance of maintaining the brand's character in repairs, it is worth reading the article on our blog: Audi and pure emotion. How do used parts help maintain the brand's DNA?.