BMW E87 LCI E90 120i 320i Petrol N43 170HP ECU Kit DME 7579142 CAS3 Key Manual

BMW E87 LCI E90 120i 320i Petrol N43 170HP ECU Kit DME CAS3 Key is a complete electronic set from the Electronic control modules and ECUs category, designed for 170 HP N43 petrol engines with a manual transmission. It includes the DME engine control unit, the CAS3 module, and a matched key, which facilitates the restoration of proper communication within the immobilizer and powertrain electronics system.

Specifications and technical data

• SKU: 7579142-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7579142
• Substitutable numbers: 12147579142, 12147599881, 12147583225, 12147507228, 12147580279, 12147593667, 7585654, 12147585654, 7575668, 12147575668, 7579144, 12147579144, 7585304, 12147585304, 12147599882, 12147573758, 12147583227, 12147583228, 12147595179, 5WK93709, 61359147212, 9147212
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU DME CAS3 kit

The presented kit is dedicated to selected BMW 1 Series E87 LCI and 3 Series E90 models with the N43 unit and manual transmission. The combination of the DME controller, CAS3 module, and key allows for consistent management of petrol engine operation, start authorization, and communication with other vehicle systems. In practice, this means the possibility of a comprehensive replacement of a damaged powertrain control system without the need for tedious matching of individual components. The kit is particularly useful for starting problems, immobilizer errors, or electronics damage following a system failure.

Benefits of using a complete ECU controller kit

Using a complete ECU DME kit with CAS3 and key provides a number of practical advantages in service and operation:

• consistency of components responsible for starting and controlling the petrol engine,
• reduction of the risk of software conflicts between modules,
• facilitation of workshop work when adapting the kit to a specific BMW vehicle,
• possibility of faster diagnostics and verification of the correct operation of the powertrain. For the user, this means a more predictable repair process and a greater chance of stable operation of the N43 unit after replacing the electronics.

Technical characteristics in the context of the engine and transmission

The kit has been prepared for the 170 HP N43 petrol engine working with a manual transmission. The DME controller manages, among other things, fuel dosing, ignition, and cooperation with safety and comfort systems, while the CAS3 module is responsible for key authorization and protection against unauthorized vehicle starting. Such a combination is particularly important in cars where precise control of the petrol unit and correct communication with the manual transmission affect the operating culture, dynamics, and fuel consumption. The kit allows for the restoration of the factory logic of the powertrain, which is crucial for professional repair.

Using a pre-owned control module in service practice

As a pre-owned item, the ECU DME CAS3 kit with key is an attractive cost-effective solution compared to new components, while maintaining the original BMW specification. In many cases, this allows for an economical vehicle repair, especially when several electronic components have been damaged simultaneously. To maximize the potential of such a solution, it is worth paying attention to the correct selection based on part numbers and hardware/software compatibility with the specific car configuration. Helpful tips in this regard, including selection by VIN/OEM, HW/SW compatibility issues, and practical installation examples, can be found in the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?

Expanding the control system in BMW – related modules

If you are planning a comprehensive repair or upgrade of the engine electronics area in your BMW and need other elements from the same group, such as additional controllers, comfort modules, or powertrain management systems, check the available parts in the BMW electronic control modules and ECUs category. Thanks to this, you can select a consistent set of components in one place, which facilitates both diagnostics and subsequent installation and configuration of the entire electronic system in the vehicle.