BMW E90 E93 325i N53 Engine Control Unit Module DME 7576721 CAS3 Key Automatic

BMW E90 E93 325i N53 Engine Control Unit Module DME CAS3 Key Automatic is a set from the Electronic control modules and ECUs category, designed for advanced management of the powertrain. The set enables coherent control of the engine and vehicle authorization system, facilitating professional repair or replacement of electronics in BMW 3 Series models with the N53 engine and automatic transmission.

Specifications and technical data

• SKU: 7576721-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7576721
• Substitutable numbers: 7576721, 12147576721, 5WK93616, 6943830, 61356943830
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the N53 DME controller

The DME engine controller in this set is responsible for precise management of the N53 unit – from fuel injection and ignition control to the coordination of auxiliary components. Using a dedicated module for a specific engine and automatic transmission configuration allows for maintaining correct operating maps, gear shifting logic, and operational parameter stability.

Combined with the CAS3 module and a matched key, it forms a coherent electronic system that can be used as a base for vehicle repair following controller failure, immobilizer issues, or damage to the starting set.

CAS3 module and key – a coherent starting set

The set includes a CAS3 module responsible for start authorization and communication with the key. Using a matched DME + CAS3 + key set significantly simplifies the adaptation process in the vehicle, reducing the need for deep software intervention and minimizing the risk of conflicts between controllers.

This solution is particularly useful in situations where the existing engine controller or CAS module has been damaged, and the vehicle reports problems with starting, bus communication, or key recognition.

Benefits of using a pre-owned BMW controller set

The engine controller set with the CAS3 module and key is a practical service solution that allows you to:

• restore a functional engine control and start authorization system in BMW vehicles with the N53 unit,
• minimize vehicle downtime thanks to a ready-to-use electronics set,
• reduce repair costs compared to purchasing new components,
• maintain compatibility with the electrical architecture and automatic transmission operating logic.

For workshops specializing in the BMW brand, such a set is a valuable component for service applications, diagnostics, or as a base for further configuration.

Professional installation and technical aspects

Due to the complexity of BMW electronic systems and the link between the DME controller, the CAS3 module, and the key, installation by a workshop with appropriate diagnostic software and experience with the brand's electronics is recommended. This allows for properly conducting necessary adaptation procedures, checking bus communication, and verifying the correct operation of all functions related to starting and engine performance.

Before installation, it is also worth verifying the compatibility of the vehicle configuration (engine type, transmission type, equipment) with the set's parameters to ensure stable powertrain operation and avoid control errors.

Related products and technical knowledge

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 engine controllers, comfort modules, or other ECU units, check the available parts in the BMW electronic control modules and ECUs category.

To better assess when choosing a used engine controller, comfort module, or sensors is technically and economically justified, it is worth reading our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?