Expedition All Four O2 Oxygen Sensor Direct Fit

Fits:  Ford 2003-2004 Expedition 5.4L , all (Before Converter Front) 2 # 250-24301 , 4 Wire , Fits Left and Right Front , (After Converter Rear) 2# 250-24001 4-Wire, Fits Left and Right Rear,     This is a BRAND NEW easy to install Direct Fit Oxygen Sensor (This is NOT a Cheap Universal O2 Sensor No Wire cutting or splicing is needed) Faulty O2 sensors can lead to catalytic converter Failure and Also is the most common reason for your check engine light being on.