Hey gear-heads, I have a regular '00 Civic VP and the check engine light turned on a week ago. I just did an oil change and I reset the light by unplugging the battery for a couple minutes but the light came on after a couple hours of driving. Lately it seems I have been losing gas mileage. I don't know if it is the cold weather (Wisconsin) or something is wrong with the car like the O2 sensor or what not. The gas cap is on tight, so that's not the problem. What is your guys' take on the problem. Thanks in advance.