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 Automatic is a complete control kit designed for 197 HP M57N2 diesel engines in facelifted BMW 3 and 5 series models. The set includes the DME engine control module, the CAS3 module, and a matched key, which facilitates restoring the powertrain to proper working order after an electronics failure. This solution is particularly useful when replacing a damaged controller in vehicles with an automatic transmission, where consistency of the immobilizer components is required.

Specifications and technical data

• SKU: 7809941-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7809941
• Substitutable numbers: 13617809941, 7809941, 0281015130, 0 281 015 130, 13618509034, 8509034, 13617811151 13617806380 13617806987 13617806152, 7811151 7806380 7806987 7806152, 13618506951 13617805288 13617808314 13617804845, 8506951 7805288 7808314 7804845, 0281014436 0 281 014 436, 61356
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and compatibility

The presented ECU DME kit with CAS3 and key is dedicated to 197 HP M57N2 units installed in BMW 3 Series E90 and 5 Series E60 LCI models equipped with an automatic transmission. Thanks to the maintained compatibility of the components within a single set, it is possible to efficiently restore communication between the engine controller, the security module, and the key, which is crucial for the proper starting and operation of the vehicle.

The complete DME + CAS3 + key configuration reduces the need for extensive programming after installation, which is particularly important in the case of modern BMW security systems. The kit will work well both for repairs following electronics damage and for replacing components sourced from accident-damaged vehicles.

Technical characteristics of the ECU DME CAS3 kit

The kit includes a DME engine controller responsible for precise control of the M57N2 unit, a CAS3 module performing immobilizer functions, and a key matched to this set. Such a configuration ensures data consistency within the security system, which minimizes the risk of conflicts during adaptation in the vehicle.

The system is designed to work with an automatic transmission, so the control logic accounts for communication with the transmission module and other controllers in the vehicle network. With proper installation and configuration, it is possible to maintain factory engine performance parameters, including the power and torque characteristics typical of the 197 HP version.

Benefits of using a complete kit

Using a complete ECU DME kit with CAS3 and key in a BMW with an M57N2 engine provides a number of practical benefits:

• consistency of the immobilizer system components, which facilitates starting the vehicle after replacing electronics,
• reduction in the scope of programming compared to installing a single controller,
• maintaining engine performance characteristics consistent with the factory 197 HP unit configuration,
• possibility of using the kit for repairs after a controller failure or damage to the electrical installation.

Thanks to this solution, it is possible to restore the functionality of the powertrain in a controlled manner, which is particularly important in vehicles used intensively or after extensive body and mechanical repairs.

Condition, origin, and service purpose

The offered kit comes from dismantling and is intended for service applications in BMW vehicles with an M57N2 engine and automatic transmission. This type of set is particularly useful in specialized workshops dealing with automotive electronics, controller diagnostics, and the adaptation of used modules.

Before installation, it is recommended to verify the compatibility of the vehicle configuration and perform full diagnostics after installation to confirm proper communication between all controllers in the vehicle network. A properly selected and prepared ECU DME CAS3 kit with a key allows for significantly shortening repair time and reducing costs compared to purchasing new components.

BMW electronic control modules and controllers

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

More about the role of original modules in modern cars

In premium vehicles, such as BMW or Audi, maintaining the consistency of electronics has a direct impact on driving characteristics and reliability. If you are interested in how properly selected used modules and controllers help maintain the factory properties of a car, it is worth reading the article Audi and emotions in their purest form. How do used parts help maintain the brand's DNA?, which discusses the importance of original electronic components in modern designs.