BMW F20 LCI 118i B38 136HP Petrol Engine Control Unit ECU DME 8691825 Manual

BMW F20 LCI 118i B38 136HP Petrol Engine Control Unit ECU DME is a factory electronic control module designed for the 136 HP B38 engine unit, compatible with a manual transmission. This is a used component from the Electronic control modules and controllers category, ideal as a replacement for a faulty control unit in your facelifted (LCI) BMW 1 Series.

Specifications and technical data

• SKU: 8691825
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8691825
• Substitutable numbers: 8691825, 0 261 S18 520, 0261S18520
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the DME control unit

The presented engine control unit is the central module managing the operation of the B38 petrol engine in the BMW F20 LCI 118i model. It is responsible for precise control of fuel injection, ignition, and interaction with engine accessories, ensuring stable operation across the full load range. It has been designed for a configuration with a manual transmission, which is crucial for proper communication with the vehicle's other systems.

Benefits of using an original ECU module

Choosing an original DME control unit for the BMW F20 LCI 118i guarantees the maintenance of factory engine performance parameters and full integration with the vehicle's electrical system. The module from this series is optimized for the petrol engine, allowing it to maintain the correct power characteristics, torque, and engine refinement. Using a control unit from the same hardware and software family minimizes the risk of compatibility issues and reduces the need for wiring modifications or additional adaptations.

Selection, compatibility, and installation

To correctly select this control unit for a specific BMW vehicle, it is recommended to verify compatibility using the OEM number, interchangeable part numbers, and vehicle data (VIN, engine type, transmission type). The module should be treated as a component requiring proper configuration – after installation, it may be necessary to match the software, synchronize with the immobilizer, and adapt it to the existing vehicle systems. A properly selected and programmed control unit allows for the restoration of full drivetrain functionality without interfering with the engine's mechanics.

Application in service practice

A used engine control unit from this series is particularly useful in situations where the existing module has suffered electronic damage, communication issues via the bus occur, or errors appear that cannot be cleared by standard diagnostics. Using an original ECU dedicated to the B38 petrol unit in the 118i version allows for effective repair while maintaining reasonable service costs. This is a solution often chosen by workshops specializing in the BMW brand and by informed users looking for proven components from dismantling.

More information about used electronics and BMW parts

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

To better understand how to safely select and install used ECU control units and other electronic modules, it is worth reading the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.