BMW E81 E87 LCI E90 E91 N43 118i Engine ECU DME Kit CAS3 + Key 7578032 Manual

BMW E81 E87 LCI E90 E91 N43 118i Engine ECU DME Kit CAS3 + Key is a complete engine control kit for petrol versions of the BMW 1 and 3 Series with the N43 engine and manual transmission. The set includes the DME engine controller along with the CAS3 module and a matched key, which facilitates the restoration of a functional electronic system after a failure or engine replacement. This solution allows for consistent matching of the powertrain electronics and security systems in one well-selected package.

Specifications and technical data

• SKU: 7578032-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7578032
• Substitutable numbers: 7578032, 7640015, 7599881, 12147583225, 12147507228, 12147580279, 12147593667, 12147585654, 12147575668, 12147579144, 12147585304, 12147599882, 12147573758, 12147579142, 12147583227, 12147583228, 12147595179, 12147593666, 12147583229, 12147507227, 12147595180, 6943834
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and compatibility

The DME kit with CAS3 and key is designed for BMW 1 Series E81/E87 LCI and 3 Series E90/E91 models with the N43 118i engine, equipped with a manual transmission. Combining the engine controller with the CAS3 module and a coded key ensures the consistency of the immobilizer system and the starting system, which significantly simplifies the installation process compared to selecting individual components.

Electronic control modules and controllers in this type of configuration are particularly important when replacing an engine, repairing electrical system damage, or resolving communication issues in the vehicle's bus. Using a complete kit minimizes the risk of software conflicts and problems with matching the software to the specific vehicle configuration.

Construction of the ECU DME + CAS3 + key kit

The offered set includes the DME engine controller, the CAS3 module responsible for starting authorization, and a key compatible with this set. Such a configuration allows for maintaining data consistency within the security and powertrain control system, which is particularly important in modern BMW designs.

Electronic control modules and controllers in this kit are factory-matched, allowing for quick restoration of full powertrain functionality after proper installation and adaptation in the vehicle. The kit is intended for petrol units, which is significant when selecting injection maps, ignition, and engine accessory management.

Benefits of using a complete kit

Using a complete DME kit with CAS3 and key in a petrol BMW with a manual transmission offers a number of practical benefits:

• consistency of the immobilizer system and engine controller,
• reduced need for programming individual modules from scratch,
• easier diagnostics and configuration after installation,
• better fit for the specifics of the N43 118i engine.

For workshops specializing in the BMW brand, such a set is a convenient solution for repairs after major electronic failures, and for the end user, it means a faster return of the car to full efficiency. A consistent powertrain control kit reduces the risk of starting problems, communication errors between modules, and software incompatibility.

Selection, installation, and technical support

Before installation, it is recommended to verify compatibility by OEM number and compare the vehicle configuration (engine type, transmission type, equipment). Professional installation should include checking the electrical system, properly connecting all harnesses, and adapting the kit using appropriate BMW diagnostic software.

To better understand the principles of selecting used engine controllers and security modules, it is worth using a guide dedicated to second-hand electronics. Detailed information on selection by VIN/OEM, hardware and software compatibility, and practical examples can be found in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.

Expanding the control system in BMW

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, powertrain management modules, or related electronic units, check the available parts in the BMW electronic control modules and controllers category.