My S80 showed both messages loose filler cap and then it would follow with emmission System Needs Servicing. I called the service department at my dealership and they explained how to put the gas cap on correctly. They put the cap on and before I could get home I had an emmission message. I was told that it would not hurt to drive the car with the emmission system needs servicing light on and the check engine light on. This has been going on since I bought the car in December 2003. I took it back to the dealership because the check engine light was on as much as it was off and I was uncomfortable driving with it on. I again got the lecture on how to put the gas cap on and again before I got home the emmission message was on. I took it in again today left it and they said they found a service bullitan that repaired the situation. I'll wait and see if this resolves the issue. I expected more from my Volvo dealership. I am disappointed in the way they handled the situation.