This product is a genuine BMW Lambda oxygen sensor, specifically designed for the 1, 2, 3, and 4 Series models with the B47 engine. The sensor, with manufacturer part number 8580408, is essential for monitoring the oxygen levels in the exhaust system to ensure optimal engine performance and emission control. Made by BMW, this oxygen sensor is a reliable and high-quality component that is essential for maintaining the efficiency and effectiveness of the vehicle's emission control system.