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Message: <blockquote data-quote="Pennywise2" data-source="post: 410491" data-attributes="member: 9021">Well one of my friends has a 97 GT and he was just driving to his local supermarket to get a few things and his check engine light came on.I ran his codes with my old SCT Xcal2 and it turns out he has not one but,two check engine light codes stored in his vehicle.Can any of you guys help him out and look up these codes or know just what they are?Possibly what parts he has to replace? Lately his exhaust fumes coming from his exhaust has been smelling strong like unburn fuel or like his vehicle could possibly be running rich. Anyone?1. P0420 CAT SYS EFF BLW THRE2. P1000 MONITOR CHECK NOT COMP</blockquote>