BMW 1 3 E87 E90 N45 116i 316i Petrol ECU Kit DME 7557809 + CAS 2 + Key Manual

BMW 1 3 E87 E90 N45 116i 316i Petrol ECU Kit DME + CAS 2 + Key Manual is a specialized component from the Electronic control modules and controllers category, designed to support the powertrain in BMW vehicles equipped with the N45 engine. This is a solution for users who expect stable operation of the petrol engine control system while maintaining the vehicle's factory characteristics and compatibility with the electrical installation.

Specifications and technical data

• SKU: 7557809-3
• 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 DME controller

The presented DME computer works with the petrol engine in BMW 1 Series E87 and 3 Series E90 models in 116i and 316i versions, ensuring precise control over the powertrain's operation. It is responsible for coordinating key engine operating parameters, such as fuel injection, ignition, and response to sensor signals, which translates into predictable performance and proper engine refinement.

This component belongs to the Electronic control modules and controllers group, meaning it is an integral part of the vehicle's electronic architecture and interacts with other onboard modules. This ensures consistent communication within the vehicle's network and proper handling of diagnostic functions.

Compatibility and operational parameters

The DME computer has been designed to work with a petrol-powered engine, which guarantees a match with the characteristics of the N45 unit used in the BMW 116i and 316i. Its application in vehicles equipped with a manual transmission allows for maintaining proper communication between the drivetrain and the controller, without the need for modifications to the installation for an automatic transmission.

The presence of dedicated part numbers and interchangeable numbers (visible in the technical specifications) facilitates the selection of the appropriate controller for a specific car configuration. This is particularly important when matching electronics to the model year, equipment version, and installed engine accessories.

Product characteristics and practical application

The offered controller comes from BMW, which helps maintain the vehicle's original operating parameters and minimizes the risk of compatibility issues. As a used component, it represents a cost-effective solution for engine control system repairs, especially in the event of a factory module failure or the need for replacement due to mechanical or electrical damage.

In practice, the DME computer is used for, among other things:

• troubleshooting issues related to lack of communication with the ECU,
• resolving problems with starting or unstable engine operation,
• restoring vehicle functionality after electrical system damage,
• comprehensive electronics repairs within the engine bay.

What to look for when choosing a used controller

When choosing a used DME computer for a BMW E87/E90, it is worth verifying the compatibility of the part number and interchangeable numbers with the vehicle's data, as well as the fuel type and transmission type. It is also helpful to compare the markings with the currently installed controller and consult with a diagnostician or automotive electrician who can confirm the possibility of adapting the module to a specific car.

If you want to better understand when purchasing a used engine controller is cost-effective and how to safely select such a component, check out our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

Expansion and other BMW control modules

If you are planning more extensive work on the electronics of your BMW engine – e.g., replacing additional control modules, components working with the DME, or other controllers responsible for the powertrain's operation – it is worth considering selecting components from the same functional group. 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 units, check the available parts in the BMW electronic control modules and controllers category.

If you are interested in the wider use of used electronics for retrofitting or upgrading your car, the following material on retrofitting may also be helpful: Retrofitting in VAG and BMW group cars: How to cheaply upgrade your car using used parts from higher versions?