BMW Mini Cooper R55 R56 N12 Petrol Engine ECU Kit DME CAS3 Key 7573701 Automatic

BMW Mini Cooper R55 R56 N12 Petrol Engine ECU Kit DME CAS3 Key is a set designed for vehicles equipped with an automatic transmission. This is a practical service solution that allows for the consistent replacement of powertrain control components in one matched package.

Specifications and technical data

• SKU: 7573701-3
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 7573701
• Substitutable numbers: 7573701, 12147589972, 7589972, 12147572264 12147572276 12147572256 12147572260, 7572264 7572276 7572256 7572260, 12147572268 12147620005 12147572270 12147620076, 7572268 7620005 7572270 7620076, 12147620001 12147620020 12147572274, 7620001 7620020 7572274, 1214757
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Disabled Vehicle Parts

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

The presented kit includes an electronic DME engine control unit, a CAS3 module responsible for start authorization, and a matched key prepared to work with this set. In Mini vehicles with the N12 unit, such a package enables the restoration of proper communication between the engine electronics, the immobilizer, and the vehicle's starting system.

Combining these elements into one set reduces the risk of coding and synchronization issues that often arise when replacing individual modules. This is particularly important in the case of cars with an automatic transmission, where the engine controller works with the transmission electronics and safety systems.

Benefits of using an original Mini kit

The DME + CAS3 + Key kit comes from a Mini vehicle, which means the factory electrical and logical architecture is preserved. Thanks to this:

• the chance of seamless integration with the existing wiring harness and vehicle installation is increased,
• the need for deep software modifications is reduced,
• matching to the N12 petrol engine configuration is facilitated.

The used nature of the kit makes it an economical solution while allowing for the preservation of the original powertrain control logic in the Mini Cooper R55/R56.

Operating parameters – N12 petrol engine and automatic transmission

The kit has been developed to work with a petrol-powered engine, which is crucial for injection maps, ignition, and the operating strategy of the power unit. The DME controller in this configuration supports N12-specific control algorithms, including mixture regulation, exhaust emission control, and on-board diagnostics.

Adaptation for an automatic transmission means that the controller software accounts for cooperation with the transmission module, including torque management, gear shifting strategies, and protective functions. This is important when replacing an ECU in cars with an automatic transmission – using the wrong version can lead to communication errors or improper transmission operation.

Condition, verification, and preparation for installation

The elements included in the kit are used, which allows for lower repair costs compared to new OEM components. Before being offered for sale, such components are standardly verified for marking compatibility, fuel type, and transmission type to facilitate selection for a specific vehicle configuration.

During installation, it is recommended to perform:

• an inspection of the electrical installation for mechanical damage and corrosion,
• adaptation and potential software matching to the specific vehicle,
• computer diagnostics after startup to check communication between modules.

Such an approach increases the chance of stable, predictable powertrain operation after replacement.

Technical support and Mini project development

If you are simultaneously upgrading other systems in your Mini – for example, the exhaust system – it is worth checking out our guide: check the article on selecting used manifolds and sports catalytic converters for BMW, Mini, and other brands. This will allow you to better plan modifications so that they are consistent with the operating characteristics of the engine controlled by this DME/CAS3 kit.

For comprehensive improvement of safety and driving comfort, you can also consider optimizing the vehicle's lighting – in this regard, the following material will be helpful: a complete guide to choosing and replacing used LED and Xenon headlights, which discusses the selection of original lighting components for BMW and Mini class cars.