Hello,

Recently, my check engine light has been acting up. The first time it lit up (about half of my tank was used up), I thought it might be the gas cap. I unscrewed the cap and re-screwed it back on. About couple hours later, the check engine light went away. However, the next day, the light went back on. I needed the car the rest of the week, so I didn't have time to take it to a dealer.

When I had little gas left, I went to fill the tank up. As soon as I started the car, the check engine light went away again. This time, it went away until half a tank again...then the light went back on. At this time, I started to think that maybe there was something wrong with the gas cap. So before I did anything, I decided to experiment this some more.

The next week, I went to fill up gas again to full and the light went away. Then, halfway thru again, the light goes on.

Do you think this might be because of a faulty gas cap? The dealer told me before that when air gets into the tank, the check engine light goes on. Maybe that would explain why everytime I fill up the tank, the light goes away (due to less air in the tank.) Has anyone else had this problem before?

Thanks!!