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

BMW E87 E90 N45 116i 316i Petrol ECU Kit DME + CAS 3 + Key Manual is an original electronic engine control unit designed for petrol engines paired with a manual transmission. This component from the Electronic control modules and ECUs category is responsible for precise engine management, ensuring stable power characteristics and proper integration with other vehicle systems. Thanks to its OEM factory design, it is the right choice for professional repair of the control system in BMW 1 and 3 series models.

Specifications and technical data

• SKU: 7557809-10
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7557809
• Substitutable numbers: 12147557809, 7557809, 12142461574, 2461574, 0261209085, 61356943814, 6943814
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Function and application of the BMW engine control unit

The presented engine control unit is the central module responsible for analyzing sensor signals, determining fuel dosage, ignition timing, and coordinating engine auxiliary equipment. In N45 petrol engines used in BMW 1 and 3 series, this ECU works with a manual transmission, allowing the control strategy to be matched to the gearbox characteristics and the driver's driving style.

By using an original module, it is possible to maintain the factory operating parameters of the powertrain, including:

• stable idle operation,
• smooth power delivery across the full RPM range,
• proper throttle response,
• correct cooperation with the vehicle's onboard systems.

Benefits of using an original control module

Using an original engine control unit instead of a damaged or unstable module allows for restoring proper powertrain operation without interfering with the electrical installation. The ECU from the same design family is factory-adapted to work with a petrol engine and manual transmission, which reduces the risk of compatibility issues.

The main advantages of this solution include:

• maintaining factory control logic – no need for universal or adapted solutions,
• consistency with other electronic modules in the vehicle,
• possibility of diagnostics and programming using standard BMW service tools,
• reduced vehicle downtime due to the installation of a component from the same design group.

Technical characteristics in the context of the powertrain

The engine control unit designed for petrol engines paired with a manual transmission is calibrated for the specific operating conditions of such a setup. This includes, among other things, the response to load changes during gear shifts, engine speed control during declutching, and cooperation with safety and comfort systems.

In practice, this means that:

• control maps are adapted to the characteristics of the petrol engine,
• the module's operating strategy takes into account manual gear selection,
• the ECU is prepared to work with the factory electrical installation of the given BMW model.

Selection, installation, and service aspects

To correctly select this engine control unit for a specific vehicle, one must pay attention to compatibility with the engine version, fuel type, and transmission type. A properly selected module allows for installation without modifying electrical harnesses, which is beneficial both technically and economically.

After installation, the ECU may require adaptation procedures or programming using appropriate service software to be correctly paired with the immobilizer and other modules in the vehicle. Performing these steps according to the manufacturer's procedure ensures stable and predictable powertrain operation.

Expanding knowledge and additional electronic system components

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, engine management modules, or units cooperating with the powertrain, check the available parts in the BMW electronic control modules and ECUs category.

To better understand the relationships between the engine control unit, comfort modules, and the multimedia system in vehicles of this brand, it is worth reading the service guide regarding BMW electronics – you will find practical tips in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using dismantled parts?.