Yeh you would be able to see just by how fast the mV readings take place to judge if you are getting lazy readings from the O2's..
And then even if no dash light you would still have a Dtc until it got bad enough to set the dash light off..
You probably have some tuning issue's
Other than that since you have Efi live I would ditch the sim's and cats then..
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2002 Z/28 = Firemutt Racing 370 w/ Cam, Trick Flow heads, TPIS 90mm Intake & 90mm T.B., Vigilante 3600 t.c., Michael's Transmissions Built 4L60E.
QTP Headers, Mufflex Stainless Y-pipe, Pypes Performance Exhaust, Moser 12-bolt w/ 33 spline axles,Truetrac & 3:73's., Spohn.
Cartek Tuned...
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