I'm afraid to post this,but what the heck.I have a 97 t100 (toy pu) 3.4l w 156K, that has GPed NOX at 15 and [...] is 1.001 at both speeds,or @15 co2 14.8, o2.3,hc 13,co .01,nox 2259 @25 co214.6,o2 .4,hc 10, co .00, nox 2291. there are no codes,under hood labe... Login to read more.