NO codes... which really makes me wonder what in the world could cause this? I mean if the wiring was faulty in any way, it would not work at all. But, like i said before, it works perfect for about 15 minutes and then quits working altogether. I dont know if it makes a difference but im running an OBD1 p30 and i dont know if it checks for "circuit out range" reguarding the o2 sensor? Any suggestions? Please!