I have a 2002 Toyota Camry 2.4l that has a p0420 code. Trying to confirm whether it's a bad catalytic converter or not. The readings for the o2 sensors are at 2500 rpm o2s11 between .56 and .66v; o2s12 between 3.2 and 3.3v. They seem to fluctuate together. I did test the temp before and after...