BMW 1 3 Series E87 E90 120i 320i N46 ECU Kit DME CAS2 2 Keys 7545042 Manual

BMW 1 3 Series E87 E90 120i 320i N46 ECU Kit DME CAS2 2 Keys is an original electronic engine control unit designed to work with the N46 engine in the 120i model. This component from the Electronic control modules and controllers category is responsible for precise engine management, ensuring stable performance characteristics and proper communication with other vehicle systems. This used DME controller is a sensible solution for repairs where technical accuracy, fitment, and cost control are priorities.

Specifications and technical data

• SKU: 7545042-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7545042
• Substitutable numbers: 12147557291, 7557291, 12147552177, 7552177, 12147552176, 12147550535, 12147550534, 7550534, 12147545043, 7545043, 12147545042, 7545042, 61356943759, 6943759, KZ
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the DME controller

The DME engine computer in BMW vehicles with the N46 unit is responsible for key engine management processes – from fuel dosing and ignition to cooperation with sensors and other electronic modules. Using a dedicated controller for the 120i version allows for maintaining factory engine performance parameters and correct communication within the vehicle's network. This solution is particularly important for repairs following electronic failure, engine replacement, or control system upgrades.

Compatibility and replacement numbers

The offered DME engine computer is an original BMW part, equipped with an OEM part number and a set of interchangeable numbers, which facilitates selection for a specific vehicle configuration. The presence of multiple reference numbers increases the chance of matching the controller to various equipment variants within the same model family. This allows for effective selection of the module based on both the engine version and the wiring harness used, as well as other modules in the vehicle.

Integration with manual transmission

The presented controller is designed to work with a manual transmission, which is significant when matching it to a specific drivetrain configuration. Proper selection of the DME for the transmission type affects the correct operation of functions related to engine load, throttle response, and communication with other modules responsible for the drivetrain. When replacing the controller, it is worth paying attention to compatibility with the transmission type to avoid issues with adaptation and diagnostics.

Condition, verification, and use in repairs

The controller is offered as a used part, which allows for significantly reducing repair costs compared to a new module, while maintaining the manufacturer's original specifications. Such components are frequently used in professional workshops specializing in BMW electronics, especially for repairs following thermal damage, water ingress, or internal errors of the previous controller. Original origin facilitates seamless integration with the vehicle's installation and proper cooperation with factory software after appropriate coding or adaptation.

Installation tips and selection based on technical data

When selecting a DME engine computer for a BMW E87 120i with an N46 engine, it is recommended to verify compatibility using the OEM part number and replacement numbers, as well as the vehicle configuration and transmission type. In practice, installation usually requires:

• checking compatibility with the existing wiring harness and other modules,
• performing coding or adaptation procedures in the vehicle,
• post-installation diagnostics to confirm correct communication within the vehicle's network.

This approach minimizes the risk of errors and allows for fully utilizing the controller's potential in daily operation.

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 engine controllers, engine management modules, or electronic control systems, check the available parts in the BMW electronic control modules and controllers category.

To better assess when choosing a used DME controller is cost-effective and what to look for when purchasing electronics, it is worth reading the guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

If you are considering a broader strategy for selecting parts – from original to replacement and used ones – additional tips regarding costs and fitment, available in the article Original, replacement, or used – which car parts are the most cost-effective?, may be helpful.