BMW E87 LCI E90 120i 320i Petrol N43 Engine ECU KIT DME 7579142 CAS3 Key Manual

BMW E87 LCI E90 120i 320i Petrol N43 Engine ECU KIT DME CAS3 Key Manual is a complete petrol engine control kit, including the DME controller, CAS3 module, and a matched key for BMW 1 and 3 series models with a manual transmission. The kit is designed for vehicles with the N43 engine, ensuring consistency in the drivetrain electronics and immobilizer system. Thanks to the factory BMW architecture, it provides a solid foundation for professional repair or replacement of a damaged control system.

Specifications and technical data

• SKU: 7579142-10
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7579142
• Substitutable numbers: 12147599881, 7599881, 12147579142, 7579142, 12147640015, 7640015, 12147621178, 7621178, 5WK93709, 61359147220, 9147220
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and compatibility

The presented ECU kit is dedicated to BMW 1 Series E87 LCI and BMW 3 Series E90 cars with the N43 petrol engine and manual transmission. It contains the components necessary for the drivetrain to operate: the DME engine controller, the CAS3 module responsible for start authorization, and the key that works with this set. This combination allows for maintaining the consistency of the security system and facilitates adaptation in the vehicle.

DME engine controller function

The DME controller included in the kit manages key operating parameters of the N43 unit, such as fuel dosage, ignition timing, and engine accessory operation. In the case of petrol engines, precise control of the combustion process is particularly important, which is why using an original module from the same family ensures stable operation and correct interaction with other vehicle systems. The kit is prepared for use with a manual transmission, which is significant for torque control logic and engine protection functions.

CAS3 module and key – an integral security system

The set includes the CAS3 module, which acts as the central element of the immobilizer and start authorization system. Combined with the matched key, it creates a coherent system, minimizing the risk of software conflicts between the engine electronics and the security system. This makes it possible to efficiently restore vehicle functionality after a failure of the original set, without the need for tedious matching of individual components.

Application in service practice

The complete ECU kit with DME, CAS3, and key is particularly useful in situations where there has been damage to the engine controller, problems with the immobilizer, or a lack of communication between modules. Using a ready-made set allows for reducing diagnostic and programming time, which is beneficial for both the workshop and the vehicle owner. Electronic control modules and controllers in the form of a kit also facilitate maintaining compliance with the factory vehicle configuration.

Why consider a used ECU kit

A used controller kit for a BMW can be a cost-effective solution, provided it is correctly selected in terms of engine type, fuel type, and transmission. In the case of N43 units, it is important that all elements – DME, CAS3, and key – come from the same configuration, which reduces the risk of problems with starting and communication in the vehicle network. You can read about the benefits and principles of safe selection of such components in the article Second life for electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, which discusses the practical aspects of purchasing used automotive electronics in detail.

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, drivetrain management modules, or ignition control systems, check the available parts in the Electronic control modules and controllers BMW category.