My '00 has 68k on it , and just recently my check engine light came on. When I got gas the next day, I noticed the gas cap was not screwed on tight at all. This is probably the source of the problem. Is there a way I can reset the light? I bet 2:1 if I take it to the Honda dealer they'll want to replace the O2 sensor, or at least charge me $75 to run diagostics.