Ok as the title says I failed my annual Pennsylvania Emmissions test on the Grand Prix due to no monitors reporting except for the Air Injection. the Mechanic was baffled as was I... and said i may have a bad PCM... gonna run it up there before I get to work on it and they are gonna re-run the test and see if another sensor may of readied .... now has anyone else experienced this? or does anyone have any idea what to do to get it through.
The car has a stock PCM so obviously nothing to do with a tune or something like that, any other mods that may (i highly doubt) that maybe causing any issue is a SLP CAI, ZZP 2 1/2" Cat back and a ZZP 2 1/2" DP.... any help would be greatly appreciated.