The Bosch Oxygen Sensor - 17028 is a high quality sensor designed to measure the amount of oxygen in a vehicle's exhaust system. It is a direct fit replacement for the original sensor and is compatible with a wide range of vehicle makes and models. This sensor helps to ensure optimal fuel efficiency and reduced emissions by providing precise readings of the oxygen levels in the exhaust. It is a durable and reliable component that is essential for proper engine performance and can greatly improve overall vehicle performance.