Looking at the graphs for my g35x. I'm a little odd by the data. -Bank 1 is around .2v +/- .4v -Bank 2 is around .5v +/- .7v They both still mirror each other on its ups and downs per the graphing. I'm so used to seeing a flatline on a bad sensor or a lazy sensor for that matter. I figured Bank 1 is just getting worn down, fault code was for Bank1's low voltage. Kinda debating on replacing both sensors at 133k Who normally would be the OE source for the sensors. Rockauto has these sensors all very closely priced. $80-101 each. Denso, NTK, Bosch.... all solid ones. Bosch's description actually says "ACTUAL OE sensor" but can that be true? If this was a toyota denso would be highly considered to me as OE.