BMW E60 LCI E90 M57N2 325d 525d 197HP ECU Kit DME CAS3 + Key 7809941 Automatic

BMW E60 LCI E90 M57N2 325d 525d 197HP ECU Kit DME CAS3 + Key is an advanced electronic set designed for vehicles with an automatic transmission. The kit ensures seamless operation of the powertrain and immobilizer system, providing a solid foundation for professional repair or replacement of the factory engine control unit in BMW 3 and 5 series models.

Specifications and technical data

• SKU: 7809941-8
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7809941
• Substitutable numbers: 13618509034, 8509034, 13617811151, 7811151, 13617806380, 7806380, 13617809941, 7809941, 13617806987, 7806987, 13617806152, 7806152, 13618506951, 8506951, 13617805288, 7805288, 13617808314, 7808314, 13617804845, 7804845, 0281015130, 0 281 015 130, 61359147196, 9147196
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the BMW E60 LCI E90 M57N2 325d 525d 197HP ECU Kit DME CAS3 + Key

The presented set includes the DME engine controller, the CAS3 module, and a matched key, which allows for maintaining coding consistency between the control unit, the security system, and the transponder. This solution is particularly useful when replacing the control set in BMW E60 LCI 525d and E90 325d models with the M57N2 engine, where compatibility of electronic components within a single vehicle is required.

The kit is configured for an automatic transmission, which is essential for the proper interaction between the engine controller, the transmission module, and driving comfort systems. This ensures the maintenance of correct operating maps, gear shifting logic, and CAN bus communication in vehicles equipped with an automatic gearbox.

Benefits of using a complete controller kit

Using a complete DME + CAS3 + key kit significantly simplifies the repair process compared to replacing individual modules. In practice, this means:

• maintaining the consistency of the immobilizer and engine controller coding,
• reducing the need for extensive programming and adaptation,
• minimizing the risk of conflicts between electronic modules,
• easier diagnostics after installation.

For workshops specializing in BMW and for advanced users, this is a solution that allows for faster vehicle recovery after an engine controller failure or damage to the CAS system.

Integration with BMW 3 and 5 series electronics

The controller kit is part of the Electronic control modules and controllers group, responsible for managing the operation of the M57N2 diesel engine and communicating with other modules in the vehicle. Proper integration with the electrical installation and the CAN network is crucial for the stable operation of the powertrain, safety systems, and comfort.

In practice, a correctly selected and configured BMW E60 LCI E90 M57N2 325d 525d 197HP ECU Kit DME CAS3 + Key allows for:

• proper engine starting while maintaining factory security features,
• consistent cooperation with comfort modules and onboard systems,
• maintaining the correct operating parameters of the 197 HP M57N2 unit.

Condition, origin, and service application

The offered set is a used original BMW component, sourced from dismantling. Such components are frequently used by specialized service centers as an economical alternative to new controllers, while maintaining the manufacturer's original specifications. For E60 LCI and E90 models with the M57N2 engine, the DME + CAS3 + key kit is a frequently chosen solution for major engine electronics failures or immobilizer issues.

To maximize the potential of dismantled parts and correctly carry out the installation and adaptation process, it is worth checking the practical tips described 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 dismantled parts. This is a valuable source of knowledge for mechanics and users planning conscious electronics repair in a BMW.

Expanding repairs with other BMW modules

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, engine management modules, or systems cooperating with the ECU, check the available parts in the BMW electronic control modules and controllers category.