BMW 1 3 Series E87 E90 E91 120i 320i N46 ECU Kit DME 7545042 CAS2 Key Automatic

BMW 1 3 Series E87 E90 E91 120i 320i N46 ECU Kit DME CAS2 Key Automatic is a factory-original electronic control unit designed to manage the engine operation in the BMW 3 Series E90 model with the N46 engine. As a component from the Electronic control modules and controllers category, it is responsible for precise fuel metering, ignition timing, and coordination with other vehicle systems. This used DME controller is a sensible service solution, allowing for the preservation of original engine operating logic at optimal repair costs.

Specifications and technical data

• SKU: 7545042-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7545042
• Substitutable numbers: 12147557291, 7557291, 12147552177, 7552177, 12147552176, 7552176, 12147550535, 7550535, 12147550534, 7550534, 12147545043, 7545043, 12147545042, 7545042, 12147531846, 7531846, 0261208540, 0 261 208 540, 61356943757, 6943757, KZ
• Gearbox type: Automatic
• ECU type: Engine Control Unit
• Category: ECUs & Computer Modules

Purpose and function of the DME controller

The DME engine controller in the BMW E90 320i N46 acts as the central processing unit responsible for controlling the combustion process, monitoring engine operating parameters, and communicating with other vehicle modules. It analyzes signals from sensors, manages the operation of injectors, the ignition system, and a range of actuators, ensuring stable and predictable engine performance characteristics.

As an Engine Control Unit, the controller works with the vehicle's electrical system and communication bus, allowing for integration with safety, comfort, and diagnostic systems. This enables error reading, parameter adaptation, and precise diagnostics during service.

Compatibility and application in BMW

The presented controller has been designed specifically for use with the N46 engine in the BMW E90 320i, which guarantees proper matching of control maps and operating logic to the characteristics of this unit. Using an original module from the Electronic control modules and controllers group allows for the retention of factory manufacturer settings, which is particularly important during repairs following an ECU failure or when replacing a damaged controller.

The device is adapted for vehicles equipped with an automatic transmission, allowing it to interface with the drivetrain while accounting for transmission operating modes and engine load. This is important for smooth gear shifting and driving comfort.

Benefits of using an original used ECU

Choosing an original, used DME engine controller for the BMW E90 320i N46 is a solution that combines technical correctness with cost-effective repair. The module retains its factory hardware and software architecture, which facilitates the coding, adaptation, and integration process with the existing vehicle installation. For workshops and users, this means a lower risk of compatibility issues compared to aftermarket replacements of uncertain origin.

To better understand when choosing a used engine controller is justified and how to properly approach the selection and installation of such a component, it is worth reading our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.

Professional use in service and diagnostics

The DME controller for the BMW E90 320i N46 is intended for professional service applications where compliance with factory manufacturer standards is required. The module works with factory diagnostic tools, enabling error reading and clearing, software updates, and the performance of adaptation procedures. This allows the workshop to carry out comprehensive engine control system maintenance while maintaining high repeatability of repair results.

Those interested in a broader perspective on the selection of used electronic components in popular car models can use our additional material: Best used car parts – a guide to the most frequently chosen original parts.

Expansion of the control system in BMW – related components

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 additional control modules, auxiliary controllers, or electronic management units, check out the available parts in the BMW electronic control modules and controllers category.