Delphi ES20408 Oxygen Sensor A protective coating on the sensor element is applied on every Delphi oxygen sensor to eliminate contaminants, such as oil or antifreeze, which can trigger the "check engine light" Designed with the benefit of more than 100 years of OE heritage, all sensors are tested for durability, performance and environmental compliance Delphi is the OE manufacturer to use planar technology as a premium upgrade when replacing old technology conical sensors Delphi features OE connectors and wire lengths within three inches of OE specifications, translating to easier installation, as well as resistance to high temperatures, vibration damage and wire corrosion, which helps protect signal accuracy and longevity Delphi oxygen sensors are subjected to rigorous testing for durability, performance and environmental compliance; Delphi's extremely low warranty rate is less than 2 percent