Delphi ES11078 Oxygen Sensor Delphi's Oxygen sensors are tested to OE standards for durability, performance and environmental compliance The construction and design of Delphi oxygen sensors provide improved fuel economy over aging sensors and long-lasting, reliable operation Delphi includes an anti-seize compound and a protective coating on the sensor element that eliminates contaminants, such as oil or antifreeze, which can trigger the "check engine light"