BMW E87 E90 116i 316i Petrol Engine N45 ECU Kit DME 7557809 + CAS2 + Key Manual

BMW E87 E90 116i 316i Petrol Engine N45 ECU Kit DME + CAS2 + Key Manual is an original electronic control module from the Electronic control modules and controllers group, designed for N45 petrol engines paired with a manual transmission. This solution allows for restoring the proper operation of the engine and related systems while maintaining factory control logic and consistency with the BMW electrical installation.

Specifications and technical data

• SKU: 7557809-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7557809
• Substitutable numbers: 12147557809, 7557809, 12142461574, 2461574, 0261209085, 61356943791, 6943791, KZ
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the controller

The presented engine computer is dedicated to BMW 1 Series E87 and 3 Series E90 models in 116i and 316i versions with the N45 petrol engine and a manual transmission. As a component responsible for managing the powertrain, it controls, among other things, fuel injection, ignition, and communication with other electronic vehicle systems, ensuring stable engine performance under various load conditions.

By maintaining the original BMW architecture, the module enables consistency with the factory wiring harness and other controllers in the vehicle, which is particularly important during powertrain repairs and diagnostics of engine electronics-related faults.

Benefits of using an original module

Using an original engine computer in a BMW E87/E90 with an N45 unit helps reduce the risk of software and hardware compatibility issues typical of low-quality replacements. The module is structurally matched to the specific configuration of a petrol powertrain with a manual transmission, which facilitates integration with existing equipment and safety systems.

In practice, this means:

• maintaining factory engine performance parameters and throttle response,
• proper cooperation with vehicle diagnostic systems,
• easier adaptation during programming and coding at a service center,
• reduced risk of communication errors between controllers.

For workshops and end-users, this translates into a more predictable repair process and the ability to effectively utilize existing BMW service infrastructure.

Characteristics of the used controller

The offered engine computer is a used component, which in the case of BMW electronics often represents a reasonable compromise between cost and functionality. Modules of this type, sourced from dismantling, are frequently chosen for repairs of daily-driven vehicles where operational efficiency and compliance with factory specifications are prioritized.

When choosing a used controller, it is worth paying attention to the possibility of matching by OEM number and interchangeable numbers – this unit has assigned reference numbers, which facilitates verification of compatibility with a specific BMW E87 or E90 configuration. This allows for precise matching of the module to the existing installation, minimizing the risk of hardware or software incompatibility.

Selection, installation, and technical aspects

When selecting an engine computer for a BMW with an N45 unit, it is crucial to consider the fuel type (petrol) and transmission type (manual) to ensure proper cooperation with sensors, equipment, and other controllers in the vehicle. Installation of such a module typically requires:

• checking compatibility by OEM number and interchangeable numbers,
• transferring or adapting immobilizer data (depending on the service procedure),
• potential coding or programming for a specific vehicle unit.

For workshops specializing in the BMW brand, this is a standard procedure that allows for restoring full functionality of the engine control system without the need to invest in a new, significantly more expensive module.

Technical support and related products

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, comfort modules, or ECU units, check the available parts in the BMW electronic control modules and controllers category.

When choosing a used engine computer or other electronic components, it is worth using practical tips regarding selection by OEM number, hardware and software compatibility, and installation procedures – this is discussed in detail in the guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?