ok, i was sort of driving my car a little harder than usual last night and everything was fine, i even let it cool off for like an hour and a half. but at the end of the night when i was driving home, my check engine light came on, but it only blinked once. i have a 99 civic hatch DX with the stock motor in it. i know i have a small leak in my exhaust manifold but i have a header on the way. does anyone know what it could be?? or is it the leak in the manifold???????