Well, my check engine light has been on for over a month (for O2 sensors, not the concerned with it) and this morning after I drop my boy off it goes out??? What the heck? I am thinking it could have been a loose connection but I never really checked them out anyway, so for now it is out. I have a feeling that it will be back anyday now though...

 

It resets itself after I believe 40 or 50 starts. If the error happens again, it will come back on.

 

The same thing happend to me. I just diagnose mine, and reset after I am done.