BMW E60 E90 E91 N52 325i 525i Engine ECU Kit DME 7553166 CAS2 Key Automatic

BMW E60 E90 E91 N52 325i 525i Engine ECU Kit DME CAS2 Key Automatic is a complete engine control kit designed for 3 and 5 series models with the N52 engine and automatic transmission. The set includes the DME engine control unit, the CAS2 module, and a matched key, which facilitates the restoration of proper drivetrain operation following an electronic failure. This solution is particularly useful when replacing a damaged control unit or performing component swaps within compatible BMW models.

Specifications and technical data

• SKU: 7553166-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7553166
• Substitutable numbers: 12147577970, 7577970, 12147553166, 7553166, 5WK90077, 6981416, 61356981416
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and function of the ECU DME CAS2 kit

The presented engine control unit kit is intended for BMW 3 and 5 series vehicles with the N52 engine and automatic transmission. The combination of the DME, CAS2 module, and key allows for maintaining the integrity of the immobilizer system and starting logic, which is crucial when replacing electronics in modern powertrains. This reduces the need for advanced programming and allows you to focus on proper installation and adaptation within the vehicle.

Benefits of using an original BMW control module

The kit from this Electronic control modules and ECUs group ensures the preservation of the factory BMW electrical architecture. The original DME controller works seamlessly with the vehicle's bus, safety system, and automatic transmission, which translates into stable engine operation, correct gear shifting, and proper communication with other modules. Using a dedicated set with the CAS2 and key also facilitates diagnostics and subsequent servicing in specialized workshops.

Integration with automatic transmission

The version designed for automatic transmission is configured for specific gear-shifting strategies, torque control, and interaction with driver assistance systems. As a result, the engine controller can correctly respond to signals from the transmission, which affects the smoothness of acceleration, downshifting, and driving comfort in various operating modes. Consistency of the DME calibration with the automatic transmission reduces the risk of communication errors and unwanted limp modes.

Professional use in BMW repairs and upgrades

The complete ECU kit with the CAS2 module and key is particularly useful for:

• replacing a damaged engine control unit after an electrical failure or water damage,
• repairing installations after collisions where multiple modules were damaged simultaneously,
• upgrade projects within the same generation of N52 units, requiring the maintenance of electronic compatibility.

This solution allows for shorter workshop turnaround times and facilitates vehicle configuration after installation, while maintaining the factory BMW security logic.

Condition and compatibility verification

The item comes from a group of original BMW components and is offered as a used part, allowing for an economical repair while maintaining the proper build quality. Before purchasing, it is worth verifying compatibility with your specific model, production year, and equipment version using the OEM part number or interchangeable numbers available in the technical specifications. Correct matching by part numbers minimizes the risk of issues with vehicle startup and communication between modules.

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

To better plan work on the electronics in the 3 and 5 series, including engine controllers, FRM modules, or the iDrive system, it is worth reading the guide: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using dismantled parts?

Additional information on selecting original used BMW components, verification procedures by part numbers, and the impact of such parts on vehicle durability is provided in the article: BMW – sports performance and precision. How do original used parts extend the life of the Bavarian icon?