Check Engine light on then off by itself...

I went to the beach last week and my VX had a surprise for me after 4 hours of driving on the highway. The "check engine" light came on. First thing I thought about was the gas cap. I checked it and it was tight already. I told myself that there was no way that you (the VX) will ruin my vacations... so I kept going and ignored it.
A couple of days after the same light went off by itself....???
No problem since then. Does anyone knows what could happened?

:)

Thanks,
Michael

It could have been your gas cap, it only does measurements at certain levels of the gas tank (like evey 1/4 tank or so)