1999 Daewoo Lanos review from North America

The check engine light has been going on recently. Not sure why. I thought it was due to air filter I purchased recently. I'm afraid to take it in to the dealer because it will probably take them a long time to figure out exactly what's wrong with it. I thought too that perhaps it was the change in gas that I used to use. I used Arco gas, but switched recently to Chevron. But honestly, I have no idea why the light keeps turning on. Perhaps it is due to fuel injection needing cleaning. Can anyone offer me any advice on this?

If anyone has any suggestions/ideas to turn off the check engine light or what my problem may be, you can email me at alejandro.hernandez@usace.army.mil

Is there a way that one can turn off the check engine light. I unplug the negative terminal over night and this turns off the check engine light for a good part of a day. But then it turns on again. While traveling at fast velocities, it turns off. When stuck in traffic, it turns right back on. This is really annoying.