when u put the new tps on their, did u make sure u had the required volts and stuff, u cant just put a tps on and adjust it by ear, at least on OBD2 cars u can't. And for the throwing a check engine light when getting your emissions on OBD1 cars ur alowed like 2 or 3 things to fail ur check engine light being one of them, but if u pass everything else then your good but most of the time u won't cause the check engine lights on for a reason lol.....