My "Check Engine" light is on on 2007 Volvo S40

I brought this car from dealer on 6/17/2011. I have 781** miles on it. My check engine light came on 15/17/2011. There was a message to check the gas cap (which I did) and the message disappeared but the light has remained on. Did someone know how long will this "Check Engine" light on?

Asked by for the 2007 Volvo S40
1 answer 1 comment
Really need to have the code pulled, otherwise your are guessing. And I would take it back to the dealer who sold it to you, they just erased the code to sell the car, most likely it was already there. Here are some shops:
Thank you so much!