Hello EMFer's I've run out of ideas,I have a 93 jeep cherokee 4.0l w/187k Fails [...] problem i see is the fuel trim goes to about -4.5 at this point NOX is around 1000ppm at 15mph,if I reset adaptive the Nox is under 500ppm. I have tried 2 new o2 sensors,both... Login to read more.