BMW 3 Series E46 323i M52 170HP ECU Kit DME 7500255 + EWS3 + Keys Automatic

BMW 3 Series E46 323i M52 170HP ECU Kit DME + EWS3 + Keys Automatic is an original electronic control module designed for the BMW powertrain with an M52 engine and automatic transmission. This controller from the Electronic control modules and ECUs group ensures proper engine-transmission cooperation, stable operation of the power unit, and correct functioning of related systems. It is a solution for users who expect compatibility with the factory electrical architecture and predictable operating parameters.

Specifications and technical data

• SKU: 7500255-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7500255
• Substitutable numbers: 12147528658 12147526754 5WK9037, 7528658 7526754, 12147513690 12147501899, 12141430845 12141438787 12141430786, 12141430785 12141430844 12147500255, 12141430273 12147500256 12147526753, 7513690 7501899 1430845, 1438787 1430786, 1430785 1430844 75002
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the controller

The presented engine computer is dedicated to the BMW 3 Series E46 323i version with an M52 unit producing 170 HP, working with an automatic transmission. As an element from the Electronic control modules and ECUs category, it is responsible for processing signals from sensors, controlling fuel dosage, ignition, and coordinating the engine's operation with the automatic transmission. A correctly selected controller allows for maintaining the operating characteristics typical of the factory BMW configuration, without the need for interference with the installation.

Compatibility and vehicle integration

The module has been designed for tight integration with the original wiring harness and other controllers in the vehicle. This makes it possible to:

• maintain factory engine and automatic transmission operating maps,
• ensure proper communication with other modules in the vehicle network,
• sustain serial performance parameters and the refinement of the power unit.

The presence of the OEM part number and available interchangeable numbers (visible in the technical specification) facilitates precise matching of the controller to a specific car configuration, which is crucial when replacing electronic components.

Technical characteristics and user benefits

As an original BMW module, the engine computer has been developed with a focus on stable operation in demanding temperature and electrical conditions. The applied hardware architecture and control software are adapted to the specifics of the M52 engine and automatic transmission, which translates into:

• consistent operation of the drivetrain across the full load range,
• correct response to signals from sensors and actuators,
• the possibility of diagnostics using standard BMW service tools.

For workshops and users, this means a predictable installation process and easier identification of potential faults in the future. The original origin of the module promotes compliance with service documentation and wiring diagrams.

Condition, service application, and practical aspects

The offered controller is a used item, which makes it an attractive cost-effective solution for repairing older BMW E46 323i models. Such modules are often used for:

• troubleshooting engine controller errors,
• restoring vehicle functionality after electrical damage,
• comprehensive repairs of the drivetrain with an automatic transmission.

Before installation, it is recommended to verify compatibility with the vehicle based on technical data and to prepare for potential adaptation or programming at a specialized service center. A correctly selected and configured controller allows for restoring stable engine operation and the proper functioning of the automatic transmission.

Expansion of the control system in BMW

If you are planning a comprehensive repair or upgrade of the engine and transmission control area in your BMW and need other elements from the same group, such as additional control modules, transmission controllers, or powertrain management units, check the available parts in the BMW electronic control modules and ECUs category.

For users interested in a broader context of using original controllers and modules in premium vehicles, it is worth reading an article describing how properly selected used electronic components help preserve the Audi brand character – you can find it here: Audi and emotions in their purest form – how used modules and electronic parts influence the brand's DNA.