Genuine OEM BMW Lambda Oxygen Sensor, part number 13628589104. This sensor is critical for monitoring the oxygen levels in the exhaust gases, enabling the engine control unit to fine-tune the air-fuel ratio for maximum efficiency and minimal emissions. It features a 4-pin connector for secure electrical connection and is installed in the exhaust system. Constructed from high-quality, heat-resistant materials, it ensures longevity and consistent performance. Genuine OEM Lambda Oxygen Sensors are manufactured to exact specifications, guaranteeing precise readings and proper integration with the vehicle's systems.