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 a complete, used electronic set designed for 197HP M57N2 diesel engines in facelifted BMW 3 and 5 series models. The set includes the DME engine control unit, CAS3 module, and a key, which allows for seamless, factory-spec cooperation of the electronic system components. This solution is dedicated to vehicles with an automatic transmission, facilitating professional repair or replacement of a damaged set.

Specifications and technical data

• SKU: 7809941-5
• 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

Purpose and function of the ECU DME CAS3 kit

The presented set belongs to the Electronic control modules and ECUs category, responsible for precise management of the engine's operation and ignition authorization. Combining the ECU with the CAS3 module and a matched key ensures immobilizer data consistency, which in practice allows for:

• restoring proper communication between the engine and the security system,
• restoring the ignition function in case of damage to the original set,
• minimizing the need for time-consuming programming from scratch.

A set configured in this way is particularly useful for advanced electronics repairs in BMW vehicles with automatic transmissions, where compatibility between multiple modules is required simultaneously.

Benefits of using a complete DME + CAS3 + key set

Using a ready-made engine control unit set with a CAS3 module and key in a BMW with an M57N2 engine provides a number of practical service benefits:

• Data consistency – the ECU, CAS3 module, and key come from a single system, which reduces the risk of CAN communication conflicts and immobilizer errors.
• Simplified diagnostics – the workshop can narrow down the area of troubleshooting faster because the key components of the system are already synchronized.
• Automatic transmission support – the set is designed for vehicles with an automatic transmission, which is crucial for the correct interaction between the engine controller and gear-shifting logic.
• Time savings – in many cases, it limits the scope of coding and adaptation compared to installing individual, unpaired modules.

Application in BMW E60 LCI and E90 with M57N2 197HP engine

The offered set is aimed at users and service centers handling BMW 3 Series E90 and 5 Series E60 LCI models with the 197HP M57N2 unit. Proper selection of the ECU along with the CAS3 module is crucial for:

• stable engine operation across the full load range,
• correct operation of security systems linked to the immobilizer,
• maintaining the driving characteristics typical for M57N2 engines.

For workshops specializing in the BMW brand, such a set is a convenient solution when replacing a damaged controller or reconstructing electronics after major failures.

Condition, origin, and installation aspects

The product is used, which in practice means it has been dismantled and was previously operated in a vehicle. Such components are frequently chosen by professional service centers when maintaining the original electronic architecture while optimizing repair costs is a priority. Before installation, a standard diagnostic procedure and verification of compatibility with the specific vehicle configuration are recommended.

Proper installation of the set requires experience in working with BMW electronics, particularly with DME and CAS3 systems. It is recommended that the operation be performed by a specialized workshop that has the appropriate diagnostic software and is familiar with adaptation procedures for controllers in vehicles with automatic transmissions.

Expanding the control system in BMW – category and expert knowledge

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

For a better understanding of how original electronic modules influence the driving character and behavior of a premium brand, it is worth reading an article describing the role of factory components in high-end cars: Audi and emotions in their purest form – how used parts help maintain the brand's DNA.