May need to replace one or more of my o2 sensors. I have 2 upstream and 2 downstream sensors, courtesy of California regulations. Does anyone know why they are all different? Any recommendations other than the highly priced dealer items. Just rebuilt the 4.0L. #6 piston skirt had cracked, engine had about 196000 miles on it. I have other postings listing some of the fun items I ran into while rebuilding it. Also seems my EVAP leak has come back again, P0455 and P0442
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