The Bosch Oxygen Sensor - 17174 is a high-quality automotive sensor designed to measure the amount of oxygen in a vehicle's exhaust gas. This information is then used by the vehicle's engine control unit to adjust the air-fuel mixture for optimal performance and fuel efficiency. The sensor is made with durable materials and advanced technology to ensure accurate and reliable readings. It is compatible with a wide range of vehicle makes and models and is easy to install. This oxygen sensor is an essential component for maintaining the overall health and performance of a vehicle's engine.