BMW E87 LCI E90 118i 318i N43 143HP ECU Kit DME 7579142 CAS3 Key Automatic

BMW E87 LCI E90 118i 318i N43 143HP ECU Kit DME CAS3 Key Automatic is a complete control unit kit designed for petrol versions of the BMW 1 and 3 Series with an automatic transmission. The kit includes the DME engine control unit, the CAS3 module, and a matched key, which facilitates efficient replacement of the control system without the need for time-consuming programming from scratch. This is a practical solution for workshops and users who want to restore full functionality of the drivetrain electronics in their vehicles.

Specifications and technical data

• SKU: 7579142-9
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7579142
• Substitutable numbers: 7579142, 12147579142, 7599881, 12147599881, 7507228, 12147507228, 7580279, 12147580279, 7593667, 12147593667, 7575668, 12147575668, 7579144, 12147579144, 7599882, 12147599882, 7583227, 12147583227, 7593666, 12147593666, 7507227, 12147507227, 5WK93709, 9147212, 61359147212, 914722
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU DME CAS3 kit

The presented kit is dedicated to BMW 1 Series E87 LCI and 3 Series E90 models with the 143 HP N43 petrol engine, paired with an automatic transmission. The ECU DME kit with the CAS3 module and key is responsible for coordinating engine operation, starting authorization, and communication with security systems. This makes it possible to restore the proper operation of the drivetrain after a failure of the original controller or issues with the immobilizer.

Combining the engine controller with the CAS3 module and key in one set minimizes the risk of incompatibility between components, which is particularly important in modern BMW vehicles where electronics are highly integrated.

Benefits of using a complete control unit kit

Using a complete ECU DME kit with CAS3 and a key provides a number of practical benefits in daily service work:

• consistency of components responsible for starting and engine control,
• reduction in the scope of coding and adaptation compared to replacing individual modules,
• possibility of faster diagnostics and vehicle startup after repair,
• better control over electronic compatibility within a given model.

For workshops specializing in BMW, this solution allows for reduced vehicle downtime and optimized repair costs, while for the end user, it means a more efficient restoration of the vehicle's full functionality.

Technical characteristics in the context of the drivetrain

The 143 HP N43 engine is a modern petrol unit where precise control of fuel dosage and ignition is crucial for smooth operation, performance, and fuel economy. The DME controller from this kit works with the automatic transmission, coordinating, among other things, gear shift timing, throttle response, and engine protection strategies.

The CAS3 module acts as the central element of the authorization system – it is responsible for recognizing the key, communicating with other modules, and authorizing the start. As a result, the entire kit forms a coherent system that, after proper installation and configuration, allows for stable and predictable drivetrain operation.

Condition, origin, and application in service practice

The offered kit comes from the Electronic control modules and controllers group and is a used item, making it an attractive cost-effective alternative to new components. For many repairs – especially in older BMW 1 and 3 Series models – using verified electronics from dismantling is a reasonable compromise between price and functionality.

In service practice, this type of kit is effective both when replacing a damaged engine controller and when dealing with immobilizer or inter-module communication issues. A properly selected DME + CAS3 + key set helps limit the number of potential failure points and facilitates vehicle configuration after repair.

Expert support and additional information

If you want to better understand how to effectively use used engine controllers and comfort modules in BMW 3 and 5 Series, it is worth checking out expert material – you will find practical tips in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 Series models using parts from dismantling?, which discusses, among other things, issues related to the selection and installation of electronics from dismantling.

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