The Delphi Oxygen Sensor - ES20378 is a high-quality sensor designed to measure the oxygen levels in a vehicle's exhaust gas. It is made by Delphi, a trusted brand in automotive parts. This sensor is used to monitor the air-to-fuel ratio in the engine, ensuring optimal performance and reducing harmful emissions. It is compatible with a wide range of vehicle makes and models and is easy to install. The Delphi Oxygen Sensor - ES20378 is a reliable and durable choice for maintaining the efficiency and cleanliness of your vehicle's engine.