so last night i was driving around and my check engine light came on. I called the dealership this morning and they told me that it was probably my gas cap and vapors were escaping from it and that's what was triggering the computer. They said to take the gas cap off and put it back on and then drive around for a few days and the computer should self correct itself. If it doesn't go off, the light starts to flash or the car starts to drive funny to call them, otherwise its fine...

does this seem right or were they just blowing me off?