BMW Mini Cooper R55 R56 N12 1.6 Petrol ECU Kit DME CAS3 + Key 7640004 Automatic

BMW Mini Cooper R55 R56 N12 1.6 Petrol ECU Kit DME CAS3 + Key is a practical solution for vehicles equipped with an automatic transmission. The kit belongs to the Computers and Controllers category and is designed for the professional repair of the drivetrain electronic system without the need for tedious programming from scratch.

Specifications and technical data

• SKU: 7640004-6
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 7640004
• Substitutable numbers: 12147589972, 7589972, 12147572264 12147572276 12147572256 12147572260, 7572264 7572276 7572256 7572260, 12147572268 12147620005 12147572270 12147620076, 7572268 7620005 7572270 7620076, 12147620001 12147620020 12147572274, 7620001 7620020 7572274, 12147572272 121
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Control Modules

Purpose and function of the ECU DME + CAS3 + Key kit

The presented control kit is dedicated to BMW Mini Cooper R55 and R56 models with an N12 petrol engine and automatic transmission. The set includes the DME engine controller, the CAS3 module responsible for start authorization, and a matched key, which allows for maintaining the consistency of the immobilizer and the vehicle's start logic.

A kit configured in this way enables the restoration of the original electronic architecture of the drivetrain, which is particularly important when replacing a damaged controller or dealing with immobilizer synchronization issues.

Benefits of using a complete controller kit

Using a ready-made BMW Mini Cooper R55 R56 N12 1.6 Petrol ECU Kit DME CAS3 + Key brings a number of practical service benefits:

• consistency of components responsible for the vehicle's start and security systems,
• reduction of the risk of software conflicts between the engine controller and the CAS module,
• facilitation of workshop work during diagnosis and installation,
• possibility of restoring the correct operation of the drivetrain after an electronics failure.

For cars with an automatic transmission, the correct cooperation of the engine controller with the gear shift logic is particularly important, which is why using a kit matched to this drivetrain configuration allows for maintaining proper operating parameters and smooth gear shifting.

Technical characteristics in the context of the drivetrain

The offered kit is intended for petrol units, which means that its maps and control algorithms are optimized for the characteristics of the N12 engine, including fuel injection, ignition, and cooperation with equipment typical for this version. Integration with the automatic transmission ensures proper data exchange between the engine controller and the transmission control system, which translates into stable acceleration and predictable throttle response.

Thanks to this, the kit will work well both for typical repairs after controller damage and for replacing the entire drivetrain electronics set in case of problems with the immobilizer or communication between modules.

Application in workshop practice

In workshops specializing in the Mini and BMW brands, complete ECU kits with a CAS3 module and key are often chosen as an effective solution for complex electronic faults. They allow for shortening diagnostic time, reducing the number of potential points of failure, and focusing on correct installation and adaptation in the vehicle.

In the case of vehicles with an N12 petrol engine and automatic transmission, the proper selection of the controller kit has a direct impact on driving comfort, smoothness of gear changes, and the correct operation of security systems.

Related components and technical knowledge

If you are planning a comprehensive repair or upgrade of the engine electronics in your Mini and need other components from the same group, such as additional controllers, engine management modules, or auxiliary systems, check the available parts in the Mini Computers and Controllers category.

When selecting a used ECU, CAS3 module, and key kit, it is worth relying on proven tips regarding automotive electronics – practical advice on how to safely choose and install such components can be found in the article The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.