The Bosch Oxygen Sensor - 16239 is a high-quality automotive sensor designed to measure the amount of oxygen in a vehicle's exhaust system. This sensor is crucial for maintaining the proper air-fuel ratio in the engine, which is essential for optimal performance and fuel efficiency. It is a direct replacement for the original equipment sensor and is compatible with a wide range of vehicle makes and models. The Bosch Oxygen Sensor - 16239 is made with durable materials and advanced technology to ensure accurate readings and long-lasting performance. It is an essential component for any vehicle's emissions control system and helps to reduce harmful emissions.