Genuine OEM BMW Lambda Oxygen Sensor, part number 11787535269. This sensor is crucial for monitoring the oxygen levels in the exhaust stream, allowing the engine control unit to adjust the air-fuel mixture for optimal combustion and emissions. It features a robust design with a high-temperature resistant probe and a protective, insulated wiring harness. Genuine OEM oxygen sensors are calibrated to provide precise measurements, ensuring efficient engine operation and compliance with emissions standards.