I filled my gas tank a week ago, drove my car for a while and then went on vacation. When I came back, my engine light was on, so I called Smart Car Service to make an appointment. The woman at the service center asked why I was bringing it in, and I told her about the engine light. She asked if the light came on after I filled my tank and I said yes. She suggested tightening the fuel cap, but when I tried to open the fuel door, it was stuck! I don't know how to get it open, so I'll have to take the car in for help.