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

BMW E87 LCI E90 120i 320i Petrol N43 Engine ECU KIT DME CAS3 Key is a complete, used control package designed for N43 petrol units in 1 and 3 Series models. The kit includes key electronic components responsible for starting, immobilizer communication, and precise engine management, facilitating professional repair or replacement of a damaged system. By maintaining component consistency from a single vehicle, this solution minimizes the risk of coding and compatibility issues.

Specifications and technical data

• SKU: 7579142-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7579142
• Substitutable numbers: 12147599881, 7599881, 12147579142, 7579142, 12147640015, 7640015, 12147621178, 7621178, 5WK93709, 61359147212, 9147212, KZ
• Fuel type: Petrol
• Category: ECUs & Computer Modules

Purpose and function of the starter kit

The presented starter kit is dedicated to BMW vehicles with the N43 petrol engine, such as the 1 Series E87 LCI and 3 Series E90. The package includes the DME engine computer along with the CAS module, which allows for the restoration of full starting logic and vehicle security without the need for tedious matching of individual components. Combining the engine controller with the CAS module ensures:

• consistency of immobilizer and key data,
• stable communication within the vehicle bus,
• proper management of starting and ignition cut-off. For workshops specializing in BMW, this is a practical solution that reduces diagnostic and assembly time, especially in cases of electronic failure due to water damage, power surges, or programming errors.

Electronic control modules and controllers in BMW

The kit belongs to the Electronic control modules and controllers group, which are responsible for coordinating the engine, safety systems, and comfort features. In the case of N43 petrol units, the DME computer manages, among other things, fuel injection, ignition, and cooperation with other modules in the vehicle, while the CAS controls start authorization and key communication. In practice, this means that a properly selected and complete starter kit:

• facilitates the restoration of full vehicle functionality after electronic damage,
• limits the need for deep software intervention,
• reduces the risk of conflicts between modules in the vehicle network. For users and service centers, it is also important that the product comes from the BMW brand, which helps maintain the factory performance parameters of the powertrain.

Benefits of using a used OEM kit

Choosing a used, original starter kit for BMW allows you to combine reasonable repair costs with the preservation of high-quality components. Compared to replacements or individual, unmatched modules, the complete DME + CAS package:

• simplifies the assembly and configuration process,
• limits the number of potential failure points,
• ensures software consistency within the engine control system. For cars with a petrol engine, stable controller operation is particularly important, as it has a direct impact on engine refinement, fuel consumption, and throttle response. A used OEM module retains factory control logic, which promotes predictable vehicle behavior.

Professional application in service and diagnostics

This starter kit works well in professional workshops dealing with BMW electronics, where repeatable results and the ability to quickly verify repairs are essential. Using a set from a single vehicle facilitates:

• testing the electrical installation after accident repairs,
• restoring vehicle configuration after module damage,
• conducting advanced diagnostics of the starting system. As a result, the service center can more efficiently handle cars with issues such as no-start conditions, DME or CAS communication errors, or failed controller programming attempts.

More solutions and knowledge about BMW electronics

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as additional controllers, comfort modules, or powertrain management systems, check out the available parts in the BMW electronic control modules and controllers category. To better understand the specifics of engine controller, CAS, FRM, and iDrive system operation in the 3 and 5 Series, as well as to learn best practices for using salvaged parts, it is worth reading the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 Series models. Additional context on the cost-effectiveness of using used OEM components in premium cars is also provided in the post about the trend of using used originals for BMW, Mercedes, and Porsche, which discusses the current situation in the parts market and the benefits of choosing proven salvaged components.