BMW E87 E90 E91 120i 320i N46 150HP ECU Kit DME 7565300 CAS3 + Key Automatic

BMW E87 E90 E91 120i 320i N46 150HP ECU Kit DME CAS3 + Key Automatic is an original electronic control unit designed for N46 engines in 1 Series and 3 Series models with an automatic transmission. This component from the Electronic control modules and controllers group is responsible for precise engine management, ensuring stable driving characteristics and proper cooperation with the automatic drivetrain. Thanks to its factory design, this ECU is the right foundation for professional repair or replacement of the controller in BMW vehicles of this generation.

Specifications and technical data

• SKU: 7565300-11
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7565300
• Substitutable numbers: 12147565301, 7565301, 12147565300, 7565300, 0261201160, 61356943834, 6943834
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the engine controller

The engine computer used in BMW 1 Series E87 and 3 Series E90 models with the N46 engine is responsible for coordinating key engine operating parameters, such as fuel injection, ignition timing, and cooperation with auxiliary systems. As a controller dedicated to the automatic transmission version, it is designed to operate in an environment where consistent communication with the transmission module and other vehicle electronics is required. A correctly selected ECU allows for maintaining the factory characteristics of the powertrain and reduces the risk of communication errors in the vehicle's bus.

Benefits of using an original BMW module

Choosing an original BMW engine computer from this series is a solution that facilitates service and diagnostics. The controller is prepared to work with factory service software, which enables:

• consistent coding and adaptation to a specific vehicle configuration,
• proper communication with other controllers in the CAN network,
• easier fault identification during computer diagnostics.

As a result, the module provides a solid foundation for restoring full powertrain functionality after a failure of the previous controller or during preventive replacement. Factory ECU architecture minimizes the risk of hardware and software compatibility issues compared to replacements of uncertain origin.

Characteristics of the used controller

The offered engine computer is a used component, which in practice means a favorable compromise between repair costs and maintaining original BMW quality. Such modules, sourced from dismantling, are frequently chosen in professional workshops because they allow for:

• reducing repair costs compared to purchasing a new ECU,
• maintaining the original hardware specifications of the controller,
• easier matching to a specific engine version and equipment level.

Before installation, it is recommended to perform standard service procedures, such as software matching, potential data cloning, or coding for a specific vehicle, in accordance with practices used in BMW automotive electronics.

Selection by part numbers and ECU compatibility

In the case of engine computers, correct selection based on the OEM part number and interchangeable numbers, as well as hardware and software version compatibility, is crucial. This controller belongs to a group where different revisions exist, so before purchasing, it is worth verifying compatibility with your vehicle using BMW catalogs or specialized service tools. This helps avoid communication problems between modules and ensures proper cooperation with the automatic transmission.

To better understand the principles of selecting used controllers and other electronic components, it is worth using the guide dedicated to this topic – a detailed discussion can be found in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?, which describes, among other things, selection by VIN/OEM, HW/SW compatibility, and practical installation examples.

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

When deciding between new and used electronic components, a guide comparing both options in terms of costs and durability may also be helpful – more information can be found in the material Car parts – new or used? We compare costs, quality, and durability, which allows you to consciously plan your repair budget.