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

BMW 1 3 E87 E90 N45 116i 316i Petrol ECU Kit DME + CAS 2 + Keys Manual is a set from the Electronic control modules and controllers group, designed for N45 petrol engines paired with a manual transmission. This solution allows for the restoration of proper engine control system operation in BMW 1 and 3 series models, maintaining the factory operating logic and performance characteristics of the powertrain.

Specifications and technical data

• SKU: 7557809-7
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7557809
• Substitutable numbers: 12147557809, 7557809, 12142461574, 2461574, 0261209085, 61356981416, 6981416, KZ
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the engine ECU kit

The presented engine ECU kit is dedicated to BMW 1 Series E87 and 3 Series E90 vehicles with the N45 engine in 116i and 316i versions, powered by petrol and equipped with a manual transmission. The kit is responsible for comprehensive control of the powertrain – from fuel injection and ignition to communication with other electronic vehicle systems. This ensures stable engine performance, proper starting, and predictable throttle response.

Benefits of using an original ECU kit

Using an original engine ECU kit in a BMW with an N45 unit provides a number of practical benefits:

• preservation of factory engine performance characteristics and compliance with manufacturer software,
• consistent communication with other controllers in the vehicle,
• possibility of proper diagnostics using standard BMW service tools,
• reduction of the risk of errors resulting from incompatible aftermarket replacements.

For workshops and users, this means a more predictable repair process and easier matching to the specific vehicle configuration. In the case of petrol units with a manual transmission, the correct cooperation of the controller with the ignition system and safety systems is particularly important, which this kit ensures.

Application in the BMW N45 powertrain

The N45 engine in 116i and 316i versions requires precise control to maintain the right balance between dynamics and fuel consumption. The engine ECU kit is responsible for:

• coordinating the fuel injection system in the petrol engine,
• adjusting operating parameters to load and temperature conditions,
• cooperating with the manual transmission regarding RPM control and idle stability.

Selecting the correct controller for the specific engine and transmission version is crucial to avoid problems with starting, uneven engine operation, or the appearance of system memory errors.

Product characteristics and condition

The offered BMW engine ECU kit comes from the Electronic control modules and controllers group and is a used item, which in practice means the possibility of an economical repair while maintaining the original manufacturer's specifications. For many BMW 1 and 3 series users, this is a reasonable compromise between cost and quality, especially in the case of older vehicle generations where a full replacement with a new controller is often uneconomical.

Before installation, a standard diagnostic procedure and matching the kit to the specific vehicle according to BMW service practice is recommended. This allows for seamless integration with the existing electrical installation and maintenance of configuration consistency.

Integration with other BMW modules

In modern BMW vehicles, the engine controller works with many other electronic modules. A properly selected engine ECU kit facilitates maintaining the consistency of the entire vehicle's electronic architecture, which translates into stable operation of comfort, safety, and onboard diagnostic systems. In the case of E87 and E90 models, this is of particular importance when resolving communication problems between modules and during subsequent software updates.

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

More about the role of original controllers in modern cars

The importance of original control modules for maintaining the brand's character and driving properties is well illustrated by an article dedicated to Audi vehicles – it describes how properly selected electronic components help maintain factory parameters and driving impressions. If you want to better understand why the correct selection of controllers is so important for preserving the manufacturer's DNA, read the material: Audi and emotions in their purest form. How do used parts help maintain the brand's DNA?.