Bosch Premium Wideband A/F Oxygen (O2) Sensors are designed for use with aftermarket high performance wideband kits Advanced Wideband sensing element for an exact air/fuel measurement vs. a typical oxygen sensor which simply sends a rich or lean signal Robust sensor design increases sensor longevity Seared protection tube due to 100% functional quality test True Direct-fit' OE connectors and harness; threads pre-coated with anti-seize compound right out of the box