BMW F20 F21 LCI F22 M140i M240i B58 340HP Engine ECU KIT DME 8489450 FEM + Key

BMW F20 F21 LCI F22 M140i M240i B58 340HP Engine ECU KIT DME FEM + Key is an original electronic control unit designed for advanced management of the B58 engine with 340 HP. This component from the Electronic control modules and controllers category is responsible for precise control of engine parameters, ensuring stable operation, proper performance, and correct communication with other vehicle systems. Thanks to its factory ECU architecture, it is optimized for seamless integration with the electrical system and software of BMW M140i and M240i models.

Specifications and technical data

• SKU: 8489450-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8489450
• Substitutable numbers: 12148489450, 8489450, 0261S19745, 0 261 S19 745, 61358781423, 8781423
• Category: ECUs & Computer Modules

Purpose and function of the engine controller

The presented engine computer is a central element of the B58 340 HP engine management system used in BMW F20 LCI and F22 models in M Performance variants. The ECU oversees, among other things, fuel injection, ignition timing, boost pressure control, and interaction with safety and comfort systems, which translates into consistent engine performance across the entire rev range.

Thanks to its factory configuration, the module is ready for integration with the vehicle's communication bus, enabling correct data exchange with other controllers such as the ABS/DSC system, transmission, or driver assistance systems. A properly selected ECU allows for maintaining original powertrain performance parameters and minimizes the risk of communication errors.

Benefits of using an original BMW ECU

Using a factory engine computer instead of a damaged or unstable controller brings a number of practical benefits:

• maintaining power and torque characteristics consistent with the M140i / M240i configuration,
• proper cooperation with factory software maps and BMW diagnostic systems,
• reduced risk of engine starting issues and random errors in the controller's memory,
• easier adaptation and coding compared to non-factory solutions.

For workshops and users, this means a more predictable repair process and the ability to restore the vehicle to factory-compliant condition regarding engine electronics.

Condition, fitment, and installation aspects

The module comes from the used OEM BMW parts group, which in practice means maintaining original build quality and compatibility with the vehicle's electrical system. When selecting a controller, it is crucial to pay attention to compatibility with the specific B58 engine version and the car's equipment configuration to ensure proper communication with other modules.

During installation, standard BMW procedures must be followed, including coding and potential synchronization with the immobilizer system and the vehicle key. A correctly selected and configured ECU allows for stable vehicle operation and facilitates subsequent computer diagnostics.

Used ECU selection and technical support

When choosing a used engine computer, it is particularly important to match it by factory part numbers and hardware/software configuration. To facilitate this process, we have prepared a guide describing the principles of selecting controllers by OEM numbers, HW/SW compatibility, and practical installation examples. Detailed information can be found in the article Used automotive electronics – how to safely select an ECU module and sensors from the secondary market, which provides practical support for mechanics and individual users.

If you are considering whether a new controller or a second-hand part is a better solution for your case, comparing the costs and durability of different solutions may be helpful. In this context, it is worth reading the material New or used? A comparison of the quality and cost-effectiveness of automotive parts, which discusses the differences between new and used OEM components.

Related BMW Electronic control modules and controllers

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

Summary

BMW F20 F21 LCI F22 M140i M240i B58 340HP Engine ECU KIT DME FEM + Key is a professional solution for users and workshops that want to restore full functionality of the engine control system in M140i and M240i models. The original module from the Electronic control modules and controllers group ensures high compatibility with the factory installation, facilitates the coding and diagnostic process, and allows for maintaining engine performance at the level intended by the manufacturer.