The Bosch Oxygen Sensor - 16421 is a high-quality sensor designed to measure the oxygen levels in a vehicle's exhaust system. It is specifically designed for use in gasoline engines and is compatible with a wide range of vehicle models. This sensor is crucial for maintaining proper fuel-to-air ratios, which helps to improve engine performance and reduce emissions. It is made with durable materials and advanced technology to ensure accurate readings and long-lasting performance. The Bosch Oxygen Sensor - 16421 is a reliable and essential component for any vehicle's emission control system.