[QUOTE=sk8erjosh09;798694]That's right! You did HiFlo's. It could be a failing sensor, let me know what happens when you switch them.

No Change ~ Unplugged & removed both 3 & 4 (post cat), swapped, then reinstalled..


Same Lambda test in DAS, several 60 sec. test and even though #3 O2 sensor’s in # 4s place, #4 it still lays low until 1500+. Heater test passed, mv test showed 750Mv +/- for each and all seems to be functioning.


Maybe I’m overthinkin this but here if you fail emissions then it’s like a Scarlet letter, like what you went through…


I’ll apologize in advance if the pic is the size of a Drive-in theater (can’t seem to get it right)


The dotted line is #3 Rt-Aft & the line along the bottom is #4 Lt_Aft (at idle)