BMW E60 E90 E91 LCI 325i 525i N53 218HP ECU Kit DME 7612455 CAS3 + Key Automatic

BMW E60 E90 E91 LCI 325i 525i N53 218HP ECU Kit DME CAS3 + Key Automatic is a complete engine control and immobilizer kit designed for selected BMW models with the 218 HP N53 engine and automatic transmission. The kit includes the DME controller, CAS3 module, and a matched key, which facilitates professional replacement of drivetrain electronics without the need for time-consuming programming from scratch. This solution is particularly beneficial in the event of a factory controller failure or issues with start authorization.

Specifications and technical data

• SKU: 7612455-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7612455
• Substitutable numbers: 12147616431, 7616431, 12147612455, 7612455, 5WK93750, 61356943834, 6943834
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and compatibility

The presented ECU kit is intended for BMW 3 Series E90/E91 LCI 325i and BMW 5 Series E60 525i vehicles with the 218 HP N53 engine, equipped with an automatic transmission. Combining the DME controller with the CAS3 module and key ensures consistency of immobilizer data, which significantly reduces the risk of software conflicts and starting problems after installation.

Due to the specifics of BMW electronics, it is recommended to verify compatibility by OEM number and replacement numbers before purchase, as well as to compare the hardware and software versions with the currently installed set. This approach minimizes the need for additional coding and reduces vehicle downtime.

Kit construction and module functions

The ECU kit includes a DME engine controller responsible for precise management of the N53 unit, a CAS3 module performing start authorization functions, and a matched key that works with this module. This configuration allows for maintaining a consistent security environment, which is crucial in modern BMW electronic systems.

Combining these elements into one set facilitates workshop work: it eliminates the need for tedious matching of individual modules, reduces the number of potential failure points, and allows focusing on correct installation and adaptation to a specific vehicle.

Benefits of using a used ECU kit

Choosing a used ECU DME kit with CAS3 and key is a reasonable compromise between repair cost and maintaining full functionality of the engine control system. This type of kit allows you to:

• restore proper vehicle starting in case of damage to the controller or CAS module,
• maintain the factory control logic of the N53 engine and automatic transmission,
• limit the scope of programming to necessary adaptations instead of full configuration from scratch,
• reduce repair costs compared to purchasing new electronic components.

Before installation, vehicle diagnostics and consultation with an automotive electrician are recommended to assess the scope of required coding and adaptation work.

Professional installation and best service practices

To fully utilize the potential of this kit, it is worth commissioning the installation to a specialized service dealing with BMW electronics. Proper connection, installation inspection, software updates, and potential configuration matching to vehicle equipment (e.g., transmission type, body version) have a direct impact on engine stability and user comfort.

For users who want to deepen their knowledge about selecting and installing used controllers, a guide describing the principles of verifying OEM numbers, HW/SW compatibility, and typical service questions will be useful – you can find it in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.

Expanding BMW electronics modernization

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

This approach allows you to organize key electronic components in one service stage, reduce the number of workshop visits, and ensure the consistency of the solutions used throughout the vehicle.