My 2004 saab 9-3 aero had a vibratin. The mechanic siaid it was the tensioner and fixed it. The tag light also stays on. He replaced the bulb with an LED light. Now when I went to pick the car up, the fan stays on even after the ignition is off. The dealer is expensive, so I used a european mechanic. I think he may ahve done something, but he says it is probably the computer system. I have been without a car for a week.