Having a problem with the GN's O2 readings. I can take the good O2 out of the TTA and put it in the GN and the O2 reading hover right around 400 - 500. That same O2 in the TTA gets reading anywhere from 100 - 800. Both are showing good cross counts on Turbolink. Anyone have any idea what could be causing this. Car stays in open loop much longer than the TTA. It has drivability problems as well. Figured this is the first place to start.