I just purchased the car 2 weeks ago today.
It just a little over 30,000 miles on it when I bought it. It now has 31,000 miles on it.
I also went to Auto Zone and had them test it. I got the one error.
I filled up with gas and put the cap back on and made sure it was tight.
The light came back on a day later.
Thanks ishop4less for your suggestions. I will try it.
I didn't purchase the extended warranty so I sure hope whatever is wrong with it isn't anything major!
Thank you all for your replies.