The Genuine BMW Oxygen Sensor - 11781735680 is a high-quality sensor designed specifically for BMW vehicles. It is responsible for measuring the oxygen levels in the exhaust gases and relaying that information to the engine's control unit. This helps the engine to adjust the air/fuel mixture for optimal performance and fuel efficiency. The sensor is made from durable materials and is precision-engineered to ensure accurate readings and long-lasting performance. It is an essential component for maintaining the proper functioning of the engine and reducing harmful emissions.