BMW E87 E90 E91 118i 318i N46 129HP ECU Kit DME 7565300 + CAS2 + Key Automatic

Visual condition of the part

The product shows signs of use visible in the photos.

BMW E87 E90 E91 118i 318i N46 129HP ECU Kit DME + CAS2 + Key Automatic is a specialized electronic control unit designed to manage the engine operation in selected 1 Series and 3 Series models. As part of the Electronic control modules and ECUs group, it is responsible for precise control of engine parameters, cooperation with the automatic transmission, and communication with other vehicle systems. This used ECU module provides a functional service solution for vehicles with the N46 engine, allowing for the restoration of proper powertrain operation while maintaining factory control logic.

Specifications and technical data

• SKU: 7565300-17
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7565300
• Substitutable numbers: 12147565300, 7565300, 12147565301, 7565301, 0261201160, 61356943791, 6943791, KZ
• Gearbox type: Automatic
• ECU type: Engine Control Unit
• Category: ECUs & Computer Modules

Purpose and function of the engine control unit

The presented engine computer is a typical Engine Control Unit designed to support the N46 petrol engine in BMW 1 Series E87 and 3 Series E90/E91 models in 118i and 318i versions. The controller supervises key engine operation processes, such as fuel injection, ignition timing, and cooperation with auxiliary systems, ensuring stable engine performance under various load conditions.

Thanks to its integration with the vehicle's wiring, the ECU communicates with other electronic modules, which enables the proper functioning of safety, comfort, and onboard diagnostic systems. A properly selected engine computer is essential when replacing a faulty controller or performing a comprehensive powertrain repair.

Compatibility with automatic transmission

This controller is designed to work with an automatic transmission, which is important when selecting parts for BMW vehicles with the N46 engine. The ECU takes signals from the automatic gearbox into account, coordinating gear shift timing with the current engine load, which affects driving smoothness and powertrain refinement.

Selecting the correct engine computer for the specific transmission type is crucial to avoid communication errors between modules and improper powertrain operation. Replacing it with the correct model allows for the restoration of proper functionality related to automatic gear selection and throttle response.

Service application and advantages of a used ECU

A used engine computer for a BMW with an N46 unit is a practical solution in the event of a factory controller failure, especially when you want to maintain the vehicle's original electronic architecture. This type of module allows for:

• restoring proper engine operation after the original ECU is damaged,
• maintaining the factory control logic characteristic of BMW,
• reducing repair costs while utilizing an original design solution.

A properly selected controller from this product group facilitates diagnostics and subsequent service maintenance, as it works with factory BMW diagnostic tools and allows for reading and clearing error codes in accordance with established procedures.

Integration with BMW electronic systems

The engine computer in the BMW E87, E90, and E91 acts as a central element of the powertrain, working with body modules, safety systems, and comfort systems. A properly functioning ECU is necessary for the stable operation of functions such as traction control, driver assistance systems, or advanced onboard diagnostics.

If you are interested in a broader context of how controllers work in BMWs, including modules responsible for lighting, comfort, and multimedia systems, it is worth reading an article describing a practical approach to repairing electronics in the 3 and 5 Series: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 Series models.

Expanding repairs in the area of BMW engine control

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