Genuine OEM BMW Lambda Oxygen Sensor, part number 11787935100. This sensor is a critical component of the exhaust system, responsible for measuring the oxygen content in the exhaust gases. This data is used by the engine control unit to adjust the air-fuel mixture for optimal combustion and reduced emissions. Proper functioning of the oxygen sensor is vital for engine efficiency, performance, and compliance with emissions standards. Genuine OEM sensors are calibrated to precise specifications for accurate readings and reliable operation.