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 BMW vehicles with the N52 engine and automatic transmission. The set includes the DME engine control unit, the CAS2 module, and a matched key, which facilitates professional electronics replacement without the need for time-consuming programming from scratch. It is a practical solution for workshops and users who want to restore the proper operation of the powertrain in a consistent and technically correct manner.

Specifications and technical data

• SKU: 7553166-6
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7553166
• Substitutable numbers: 12147577970, 7577970, 12147553166, 7553166, 5WK90077, 61356964051, 6964051
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and function of the ECU DME CAS2 kit

The presented control kit is intended for BMW 3 Series and 5 Series models with the N52 engine, such as the 325i and 525i, equipped with an automatic transmission. Combining the DME engine controller with the CAS2 module and the key ensures the consistency of the immobilizer system, which is crucial for the correct starting of the engine and the stable operation of all related electronic systems. Thanks to this kit, it is possible to perform a technically correct replacement of a faulty controller in BMW E60, E90, and E91 vehicles without the need to mix components from different sets.

Benefits of using a complete DME + CAS2 + key kit

Using a complete engine control kit with the CAS2 module and key allows for reducing the risk of immobilizer synchronization issues, bus communication errors, and failed starts. In workshop practice, this means:

• a consistent set of components originating from a single control system,
• easier adaptation to the vehicle compared to a single controller,
• reduced time required for diagnostics and configuration,
• greater predictability of the final result after installation.

For the user, this means faster restoration of vehicle efficiency and more stable powertrain operation. Electronic control modules and controllers in BMW are responsible not only for the start-up itself but also for precise control of engine operating parameters, which is why choosing a complete kit is essential for reliability.

Compatibility, reference numbers, and OEM selection

The offered kit belongs to the BMW electronic control modules and controllers group, where compliance with OEM numbers and interchangeable numbers is of key importance. The DME controller, CAS2 module, and key have been factory-matched to work together in one vehicle, which facilitates fitting to a specific N52 engine and automatic transmission configuration. When selecting, it is always recommended to verify the OEM part number and reference numbers based on vehicle data, such as the VIN, to ensure full hardware and software compatibility.

To better understand the principles of selecting used electronics, the differences between hardware and software versions, and installation procedures, it is worth using the expert guide from Global Parts: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. The article explains how to safely select and install ECU modules, including DME controllers and related components.

Product characteristics and workshop purpose

The product comes from the BMW brand and is part of the original engine control system, which translates into proper fitment to the vehicle's electrical architecture. The kit is in used condition, which in practice means it comes from dismantling, and its main advantage is the possibility of economical vehicle repair while maintaining the manufacturer's original specifications. This type of solution is particularly beneficial for specialized workshops that service BMW E60, E90, and E91 models and want to shorten repair time and reduce costs compared to purchasing new controllers.

Thanks to the use of a kit with a matched CAS2 module and key, the process of restoring vehicle functionality after an engine controller failure is more predictable, and the risk of needing additional programming or replacing further electronic components is minimized.

Repair expansion within BMW electronics

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 additional controllers, comfort modules, or engine management systems, check the available parts in the BMW electronic control modules and controllers category.

For larger repair projects involving both electronics and powertrain components, the guide on the cost-effectiveness of using used mechanical parts may also be helpful: Why it is worth buying used gearboxes and engines – facts instead of myths. It allows you to better plan your budget and the scope of work for a comprehensive vehicle renovation.