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

BMW Mini Cooper R55 R56 N12 1.6 Petrol ECU Kit DME CAS3 + Key is a complete engine control kit designed for N12 1.6 petrol units paired with a manual transmission. The set includes the DME engine control unit, the CAS3 module, and a matched key, which facilitates the restoration of proper drivetrain electronics operation after a failure or when replacing a used engine. It is a practical solution for workshops and users who need a consistent, factory-spec control package.

Specifications and technical data

• SKU: 7640004-7
• 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: Manual
• Category: Control Modules

Application and function of the ECU kit

The presented ECU kit is intended for Mini vehicles with an N12 1.6 petrol engine, equipped with a manual transmission. The DME controller is responsible for precise management of the engine's operation, including fuel injection, ignition, and communication with other vehicle systems. The CAS3 module plays a key role in start authorization, communicating with both the DME and the key, which ensures the consistency of the entire system.

Combining the DME, CAS3, and key into one set minimizes the risk of component matching issues, which is particularly important when replacing used drivetrain electronics. Thanks to this solution, it is possible to efficiently restore the original security and engine control logic in the vehicle.

Benefits of using a complete DME CAS3 + key kit

Choosing a complete ECU kit for a Mini with an N12 1.6 petrol engine and manual transmission provides a number of practical assembly and service benefits:

• consistency of control elements – the DME, CAS3, and key come from a single system, which facilitates vehicle electronics configuration,
• reduction of the need for programming from scratch – the kit can serve as a base for adaptation in the vehicle,
• preservation of factory security and start authorization logic,
• easier diagnostics – a unified control set simplifies the analysis of potential faults.

For workshops specializing in the Mini brand, such a kit is a convenient solution when replacing a damaged engine controller or during engine swaps within the same generation of R55/R56 models.

Operating characteristics with a petrol engine and manual transmission

The N12 1.6 petrol engine requires precise control of operating parameters, and a properly selected ECU kit has a direct impact on the engine's refinement, throttle response, and idle stability. Configuration for petrol fuel ensures correct injection and ignition maps, adapted to the characteristics of this unit. Cooperation with a manual transmission means that the control logic is matched to manual gear shifting, which affects the smoothness of acceleration and downshifting.

An ECU kit configured in this way allows for the preservation of the original driving characteristics of the Mini Cooper R55/R56, while maintaining compliance with factory safety and comfort systems that communicate with the DME and CAS3 modules.

Condition, verification, and selection of used electronics

The offered kit belongs to the Computers and Controllers category and is a used item, which is relevant when planning a repair budget. Used engine electronics, when properly selected and verified, can be a rational alternative to new components, especially in vehicles that are several or more years old. It is crucial to match the kit to the specific engine version, fuel type, and transmission type – in this case, the petrol N12 1.6 with a manual gearbox.

If you want to better understand when choosing a used engine controller, comfort module, or sensors is justified, it is worth reading the guide: The second life of electronics – when is it worth opting for used engine controllers, comfort modules, and parking sensors?. You will find practical tips there regarding the selection and assessment of such components.

Expanding work in the area of Mini electronics

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

For those interested in the broader context of the brand's development and the role of original electronic components in preserving the car's character, the following article may be helpful: Classic Mini vs modern MINI – how the construction has changed and which original Mini parts help preserve their character. Thanks to it, you will more easily assess how the selection of the right controllers affects the preservation of the vehicle's factory properties.