I’ve needed to get emissions done on my car for a long time and was told that the system is reading not ready. So I waited a few more days and was told the same thing. I have a NGM reflash and vaguely remember that I may need to put the stock ecu back in when doing emissions. After putting the stock ecu back in the codes in the title are showing up. The dilemma is I’m not sure if these codes were not showing up because of the reflashed ecu or if I possibly messed something up when swapping the ecu. I was pulling kind of hard at times to get the ecu out and I have the mafterburner harness tied into the wires with heat shrink tubing or butt connectors. I wondering if one of the connections is possibly loose. Before I swap the reflash ecu back in to see if the codes go away does anyone have any advice?