Needed to pass emissions last month. I have a ZZP catted downpipe (j hook O2 bung), K&N drop in- ZZP intake tube- and 21psi Trifecta/HP combo tune done last year.
I have done the GM driving cycle numerous times and no matter what the catalyst monitor, and the O2 monitor are incomplete. Only need to get one monitor to run to pass emmisions. Anyone have the same problem. I'm almost sure a problem lies in the tune but since I am not the tuner and I am having trouble contacting my tuner, I'm at a standstill. Is the Trifecta/HP tune normally locked? Looking for anyway to get one monitor to run. Will installing the stock DP solve one? Thanks