BMW E60 LCI 525i E90 E91 325i N53 218HP ECU Kit DME 7586940 CAS3 + Keys Manual

BMW E60 LCI 525i E90 E91 325i N53 218HP ECU Kit DME CAS3 + Keys Manual is a complete engine control and immobilizer kit designed for selected BMW models with the N53 218HP engine and manual transmission. The set includes the DME controller, CAS3 module, and matched keys, which facilitates the restoration of proper powertrain electronics operation after a failure or engine replacement. This is a practical solution for workshops specializing in the BMW brand and users looking for a proven, used ECU kit.

Specifications and technical data

• SKU: 7586940-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7586940
• Substitutable numbers: 12147616431, 7616431, 7586940, 5WK93648, 61359147196, 9147196
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Application and compatibility

The presented ECU kit is intended for BMW 5 Series E60 LCI 525i and BMW 3 Series E90 / E91 325i vehicles equipped with the N53 218HP engine and manual transmission. Combining the DME controller with the CAS3 module and keys allows for maintaining the consistency of the vehicle's security system, which is particularly important when replacing electronics after damage, flooding, or communication issues in the bus.

The kit is suitable for vehicles where matching the engine controller to the CAS3 immobilizer module and key transponders is required, which significantly reduces the time needed for configuration and programming compared to sourcing individual components.

Construction of the ECU DME + CAS3 + keys kit

The set includes an electronic DME engine controller responsible for managing the N53 unit, a CAS3 module acting as an advanced access authorization and starting system, and matched keys with stored immobilizer data. Such a combination ensures data consistency throughout the system, which facilitates starting the vehicle after installation.

Electronic control modules and controllers of this type work with sensors, electrical wiring, and vehicle safety systems, which is why using a complete kit minimizes the risk of software conflicts and communication errors in the CAN network.

Benefits of using a used BMW ECU kit

Using a complete, used ECU DME kit with a CAS3 module and keys brings a number of practical benefits:

• consistency of immobilizer and engine controller data,
• limiting the scope of programming to the necessary minimum,
• possibility of faster diagnostics and starting the vehicle after repair,
• attractive cost-to-functionality ratio compared to new components.

For workshops specializing in the BMW brand, such a kit is a convenient service solution, allowing for efficient restoration of the powertrain's performance after an electronics failure.

Condition, verification, and selection of the appropriate controller

The product comes from the group of used electronic control modules, which means that standard diagnostics and matching to the specific vehicle configuration are recommended before installation. In workshop practice, it is important to check the compatibility of the software version, vehicle equipment, and transmission type to ensure proper cooperation with the existing installation.

To better understand when choosing a used ECU kit, comfort module, or other electronic elements makes sense, it is worth reading the guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?. The article helps to assess the cost-effectiveness of such a solution and draws attention to key aspects of selecting and testing components.

Expanding BMW electronics repairs

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