denso super class first time fit oxygen sensor 4-wire 27.17 in. lead wire; an oe direct plug in oxygen sensor; constructed from high quality stainless steel porous polytetrafluoroethylene fluorine rubber aluminum oxide high-grade platinum and ceramics; features double protection layer aluminum oxide trap layer porous ptfe filter and stainless steel housing; specifically designed to meet the challe nging demands of today s engines and precision crafted to meet oe standards; 1 required per vehicle; requires no wire cutting