CEL p1148

Originally Posted by 1slow370

that is not the lower sensor in the test pipe that is the sensor up by the exhaust manifold check to make sure the wire isn't cut or melted. the front two sensors are the A/F sensors the rear two are sensors for the cats and they don't effect the closed loop, open loop control. they should have wrapped a a fiber glass heat blanket around the area before torching up there as there is almost no way to not burn something or used a small cutoff grinder with an extention arbor or flex shaft. probably burned up the end of your wiring harness or yes melted a 560 dollar factory 5 wire wideband sensor passenger side is bank one, pull the HFC, an O2 wrnench that looks like a crows foot(the tool not the bird) from an autoparts store for 11 dollars, reach down from the top unclip the wire connecter, and puth the crowfoot socket on from the bottom and crank it out with a ratchet, use antisieze reinstall, then reverse removal for the rest, would take about 2 hours for a shop