BMW E90 E91 E92 N52N 325i 218HP Engine ECU Kit DME 7577068 CAS3 Key Automatic

BMW E90 E91 E92 N52N 325i 218HP Engine ECU Kit DME CAS3 Key Automatic is a complete engine control kit designed for petrol units with an automatic transmission in the BMW 3 Series. The kit includes the DME engine control unit, the CAS3 module, and a matched key, which significantly facilitates professional control system replacement. As a result, you receive a consistent, factory-spec electronics package that allows for efficient vehicle repair or adaptation.

Specifications and technical data

• SKU: 7577068-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7577068
• Substitutable numbers: 12147577068, 7577068, 12147581123, 7581123, 5WK90190 12147581124, 7581124, 61356943834, 6943834
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and purpose of the ECU DME with CAS3 kit

The presented kit is dedicated to BMW 3 Series models of the E90, E91, and E92 generations with the N52N 325i 218 HP petrol engine and automatic transmission. Combining the DME engine controller with the CAS3 module and key ensures system consistency for the immobilizer, which is crucial when replacing electronics in modern BMW vehicles.

A kit configured in this way allows for:

• maintaining compatibility between the engine controller and the CAS3 module,
• avoiding issues with key authorization and engine starting,
• speeding up the diagnostic and vehicle startup process after repair.

Benefits of using an original control kit

The original kit from the Electronic control modules and controllers group ensures proper cooperation with the factory BMW electrical installation. Using a complete DME + CAS3 + key package minimizes the need for additional programming and reduces the risk of incompatibility between individual system components.

The main advantages of this solution include:

• Security system consistency – the engine controller, CAS3 module, and key are synchronized with each other, which facilitates immobilizer configuration.
• Better compatibility with the vehicle's installation – the components come from the same BMW model platform, which promotes the correct operation of onboard systems.
• Time savings in the workshop – a ready-made set reduces the number of steps required to adapt the electronics to a specific car.

Technical characteristics regarding the engine and transmission

The kit has been designed to work with the N52N 325i petrol engine and an automatic transmission. This means that the control maps, DME operating logic, and communication with transmission modules are adapted to the specifics of this powertrain configuration. In practice, this translates into proper management of fuel dosage, ignition, transmission operation, and driver assistance systems.

For workshops specializing in the BMW brand, this is a particularly useful solution for:

• replacing a damaged engine controller in vehicles with an automatic transmission,
• swapping power units within the same model generation,
• diagnosing starting problems resulting from electronic inconsistencies.

Condition, verification, and selection of a used controller

The component comes from the secondary market, which allows for economical vehicle repair while maintaining the factory system architecture. A used ECU DME kit with CAS3 and key is a popular choice for workshops looking for a reasonable compromise between cost and functionality. Before installation, standard diagnostic verification and consultation with an automotive electrician are recommended to confirm compatibility with the specific car configuration.

If you want to better understand when choosing a used engine controller is cost-effective and how to safely select such a component for your car, read our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

Support in selecting BMW electronics

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as DME controllers, CAS modules, or other body controllers, check the available parts in the BMW Electronic control modules and controllers category.

For those considering wider use of used electronic components or planning a car upgrade project, an article describing common pitfalls when buying second-hand parts may also be helpful: Buying used car parts – the most common mistakes when choosing tuning parts.