This Bosch Lambda Sensor (0258027104) is a regulating oxygen sensor designed for placement before the catalytic converter. It has an overall length of 380 mm and 5 circuits, with a recommended replacement interval of 250,000 km. The sensor is compatible with BMW OEM references 11788644371 and 863137101, as well as STEYR 864437101. It is suitable for various BMW models, including the 1 Series (F20) M 140i and M 140i xDrive, from July 2016 to May 2019. The sensor features a vehicle-specific connector for a secure electrical connection, optimizing engine combustion and efficiency. It has undergone functional and quality testing to meet original equipment standards for high performance and reliability. Bosch continuously develops its products to ensure they meet the latest technological standards. This part is installation-ready. Please use the vehicle identification to confirm compatibility and observe all restrictions. Work should only be carried out by trained specialists.