BMW E90 E91 E92 335i 306HP Engine N54 ECU Kit DME 7575875 + CAS3 + Key Manual

BMW E90 E91 E92 335i 306HP Engine N54 ECU Kit DME + CAS3 + Key Manual is a complete engine control kit designed for 3 Series models with the 306HP N54 engine and a manual transmission. The set includes the DME engine control unit, the CAS3 module, and a matched key, which facilitates restoring full electronic system functionality after a failure or engine replacement. This solution allows for a consistent match between the immobilizer components and the ECU, significantly simplifying the installation and configuration process.

Specifications and technical data

• SKU: 7575875-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7575875
• Substitutable numbers: 12147616431 5WK93628 61356943834 12147575875, 7616431 6943834 7575875
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented ECU kit is dedicated to the 306HP N54 petrol engine in BMW 3 Series E90, E91, and E92 generation models equipped with a manual transmission. Combining the DME controller with the CAS3 module and the key ensures a coherent start authorization system, which is crucial when replacing engine electronics or the complete powertrain.

In practice, this means the ability to restore the original engine operating logic, including fuel injection management, ignition, and anti-theft protection, without the need for time-consuming individual module matching. The kit is particularly useful for repairs following electronic damage, water ingress, or unsuccessful software modifications.

Advantages of using the complete DME + CAS3 + key kit

Using a complete control kit offers a number of practical benefits:

• Electronic consistency – The DME, CAS3, and key are paired with each other, which facilitates immobilizer configuration and minimizes the risk of conflicts between modules.
• Time savings during diagnostics – A ready-made set reduces the number of variables when starting the vehicle after repair, which speeds up workshop operations.
• Better control over N54 engine performance – A correctly selected controller allows for maintaining factory maps and the performance characteristics of the 335i unit.
• Solution tailored to manual transmission – The kit configuration is prepared for the specifics of a manual gearbox, which is important for torque control logic and safety functions.

Application in service and tuning practice

The ECU set with DME, CAS3, and key will prove useful both in professional workshops and in BMW 3 Series enthusiast projects. It can be used for:

• restoring a functional control system after engine electronics damage,
• swapping the N54 unit between E90, E91, and E92 bodies,
• restoring factory configuration after unsuccessful software modifications,
• building track projects where stable and predictable engine control is required.

Thanks to maintaining the original control architecture, it is possible to introduce controlled software modifications later by specialized companies, based on a correctly functioning set.

Category characteristics and integration with vehicle electronics

The product belongs to the Electronic control modules and ECUs group, which are components responsible for managing key vehicle functions. In the case of the N54 engine, the DME controller cooperates with many other modules in the vehicle network, and the CAS3 is responsible for start authorization and communication with the key. Using a complete kit helps maintain communication consistency in the bus and limits problems with errors related to the immobilizer.

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

Product condition and installation recommendations

The offered kit comes from dismantling and is intended for re-installation in a compatible vehicle. Due to the nature of engine electronics, installation by a workshop with experience in BMW 3 Series models and access to appropriate diagnostic software is recommended. This allows for verification of communication in the vehicle network, adaptation, and potential configuration matching to a specific vehicle.

Before installation, it is worth performing a full diagnostic of the vehicle's electrical system to rule out additional damage to wiring or other modules that could affect the operation of the engine controller and CAS3.

Substantive support and knowledge about BMW electronics

For users and workshops that want to better understand the specifics of BMW electronic module operation, a guide describing practical aspects of repairing iDrive systems, FRM modules, and engine controllers in the 3 and 5 Series will be useful. Detailed tips can be found in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 Series models using parts from dismantling?, which discusses, among other things, the use of proven parts from dismantling in professional repairs.

Summary

BMW E90 E91 E92 335i 306HP Engine N54 ECU Kit DME + CAS3 + Key Manual is a practical solution for those who need a complete, matched engine control kit for the N54 unit in a manual transmission version. Combining the DME controller, CAS3 module, and key facilitates restoring the efficiency of the powertrain, reduces the time needed for immobilizer configuration, and provides a solid base for further service work or modifications.