my check engine light is on on 2006 Saturn Vue

I just purchase the vehicle less than a week ago. The engine light came on Monday and I took the vehicle back to the dealer on Monday. The vehicle was checked, stating they could not find a problem. The engine light has come on again.

Asked by for the 2006 Saturn Vue
2 answers
Check the gas cap if worn it could cause this, If that is not the problem put a higher grade of gas. This happen to me and a friend told me to disconnect the battery and it will reset it selp (after you check the other) You have to trun it off and on a couple of times and then the light will go off. Mine has 63,000 miles and this happen to me.
I had the same problem. Ended up being a loose gas cap. Had to be replaced twice because the first one was defective. Suggest trying to replace the cap.