2000 Beetle.. Check Engine light going on/off

My check engine light will be on one day and then off the next... anyone have the same problem? should i be concerned? car seems to be running fine...

when the light is on, go to autozone. They have the scanner called "OBD II" scanner. Ask them to read the code, it is free. From there you could find what cause the problem, if you still don't know, you can tell us here the code, so we can help you.