Mini Cooper S R60 N18 184HP Engine ECU Kit DME CAS3 + Key 7639421 Manual

Visual condition of the part

The product shows signs of use visible in the photos.

Mini Cooper S R60 N18 184HP Engine ECU Kit DME CAS3 + Key is an advanced electronic set designed for vehicles with a manual transmission and a petrol engine. The set constitutes a coherent package of control components, facilitating the professional replacement of a damaged engine control unit along with the associated immobilizer and key.

Specifications and technical data

• SKU: 7639421-1
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 7639421
• Substitutable numbers: 7639421, 12147639421, 8652746, 12148652746, 8621260, 12148621260, 0261S07739, 0 261 S07 739, 9267609, 61359267609
• Fuel type: Petrol
• Gearbox type: Manual
• ECU type: Engine Control Unit
• Category: ECUs & Computer Modules

Purpose and configuration of the set

The presented ECU kit is dedicated to the Mini Cooper S R60 with an N18 184HP engine, running on petrol. The set includes an Engine Control Unit, a CAS3 module responsible for start authorization, and a matched key, which allows for maintaining the integrity of the vehicle's security system.

The configuration is prepared for a manual transmission, ensuring that the engine operating parameters, control logic, and communication with other modules are consistent with the factory specifications for this drivetrain version.

Function of the engine control unit and CAS3 module

The engine control unit in this set manages key processes of the N18 unit, such as fuel injection, ignition, and cooperation with auxiliary equipment, ensuring stable power and torque characteristics. The CAS3 module is responsible for key identification, immobilizer operation, and communication with other electronic control modules and controllers in the vehicle.

Since the ECU, CAS3, and key come from a single set, the risk of immobilizer synchronization issues is minimized, which in practice reduces diagnostic time and speeds up the process of starting the vehicle after replacement.

Benefits of using a complete ECU kit

Using a complete engine control unit package with a CAS3 module and key is particularly beneficial in situations where both the ECU and security system components have been damaged. Such a set:

• simplifies the installation and adaptation procedure compared to replacing a single module,
• reduces the need for deep immobilizer programming,
• ensures software consistency between the engine control unit and the CAS3 module,
• facilitates work for workshops specializing in Mini electronics.

For the user, this means a more predictable repair process and a better chance of quickly restoring full functionality to the drivetrain.

Condition, verification, and practical application

The components included in the set are from disassembly and are offered as used OEM Mini components. This type of solution is often chosen by workshops and informed users who are looking for factory-matched modules at a reasonable price while maintaining the original electronic architecture of the vehicle.

Before installation, a standard diagnostic procedure and verification of software compatibility with the specific car configuration are recommended. Professional installation in a specialized automotive electronics service allows for fully utilizing the potential of the set and reducing the risk of communication errors in the vehicle's network.

Expansion of the control system in Mini

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

For those who want to better understand the principles of selecting and installing used controllers, a guide describing the practical aspects of working with electronics from disassembly will be useful – more information can be found in the article on choosing used ECU modules and sensors. In the context of the broader onboard electronics ecosystem, it is also worth reading the material regarding iDrive systems and controllers in BMW, which discusses good service practices and the use of parts from disassembly: guide on maintaining electronic modules for BMW 3 and 5 series.