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

BMW 1 3 E87 E90 N45 116i 316i Petrol ECU Kit DME + CAS 3 + Key Manual is a specialized electronic control unit designed for N45 petrol engines in 1 and 3 Series models with manual transmissions. This component from the Electronic control modules and controllers category is responsible for precise engine management and cooperation with the CAS system, ensuring stable and predictable driving characteristics. Thanks to the original BMW design, the module allows for the preservation of factory powertrain performance parameters.

Specifications and technical data

• SKU: 7557809-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7557809
• Substitutable numbers: 12147557809, 7557809, 12142461574, 2461574, 0261209085, 61356943814, 6943814, KZ
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the DME controller

The presented DME computer is designed to work with the N45 petrol engine in BMW E87 and E90 series models in 116i and 316i versions, equipped with a manual transmission. The controller is responsible for coordinating key engine performance parameters, such as fuel dosage, ignition timing, and response to sensor signals, which translates into smooth power delivery and proper engine operation.

Thanks to the integration with the CAS system, the module participates in start authorization, working with the immobilizer and vehicle electronics. A properly selected DME computer helps avoid issues with starting the car, communication errors in the vehicle network, and incorrect engine operation after replacing the controller.

Benefits of using an original BMW module

Using an original controller from the Electronic control modules and controllers category ensures compatibility with BMW's factory electrical architecture. This means proper communication with other modules in the vehicle, predictable behavior of onboard systems, and the ability to perform correct programming and adaptation at a service center.

The main advantages of this solution include:

• preservation of factory engine control maps,
• proper cooperation with the CAS system and immobilizer,
• compatibility with the electrical installation of E87 and E90 models with the N45 unit,
• possibility of diagnostics and coding using standard BMW tools.

Choosing a used, original control module allows for reduced repair costs while maintaining high quality and full functionality of the engine control system.

Vehicle fitment and technical issues

To ensure the correct operation of the DME computer, it is crucial to match it to the specific vehicle configuration – N45 petrol engine, 116i or 316i version, and manual transmission. It is also important to pay attention to OEM part numbers and interchangeable numbers, which allow for verifying compatibility with a given car.

Before purchasing, it is worth comparing the controller markings with the component installed in the vehicle or using VIN-based selection. This makes it easier to avoid problems with CAN network communication, engine control errors, or the need for additional installation modifications. A correctly selected DME module minimizes the time required for installation and configuration in the workshop.

Condition, installation, and operation

The offered DME computer comes from dismantling and is a used component, which allows for an economical repair of the engine control system while maintaining the original BMW specification. Before installation, it is recommended to perform a standard diagnostic procedure and – if necessary – match the controller to the vehicle (programming, synchronization with CAS) in accordance with the manufacturer's procedures.

Professional installation in a specialized service center or workshop dealing with BMW electronics allows for fully utilizing the module's capabilities, reducing the risk of errors, and ensuring stable engine operation across the entire load range. This solution is particularly beneficial when replacing a damaged controller after an electrical or mechanical failure.

Technical support and additional information

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

For users considering the purchase of a used engine controller or other ECU modules, the guide describing selection by VIN and OEM numbers, hardware and software compatibility issues, and practical installation examples will be particularly useful – you can find it in the article "Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?".