Alright, I just bought a 2002 Mazda Protege5. It's in OK condition. It's been wrecked before and repaired (mostly). When I start it, the check engine light does not appear when I turn the key to the acc/on position (before starting it). I would assume that it should come on just like the ABS light and oil light until the car is started. Where is it even located? I'm starting to think that maybe the guy I bought it from took the bulb out so it would seem like there wasn't anything wrong with it. There were a few other things he didn't tell me about that I figured out after a few days of buying it, so I'm starting to think I got a pretty bad deal.