The Bosch Oxygen Sensor - 16138 is a high-quality automotive sensor used to measure the oxygen content in a vehicle's exhaust system. This sensor is designed to accurately detect the amount of oxygen present in the exhaust gas and send this information to the vehicle's engine control unit. This data is used to adjust the air-to-fuel ratio, ensuring optimal engine performance and reducing harmful emissions. The Bosch Oxygen Sensor - 16138 is a durable and reliable sensor that is compatible with a wide range of vehicle makes and models. It is an essential component for maintaining the efficiency and performance of a vehicle's engine.