Well, I've had the odd glitch with my dealership but overall am very happy. They treat me very well. This sounds like one of those situations where you have to decide if they otherwise take pretty good care of your car. I've dealt with a lot of dealerships that I don't believe should be in business. If you've lost confidence in them you may want to go shopping for another dealership, otherwise you might have to write this one off as an isolated incident.
It'* great that your car is back in shape. If they charged you for the scan, did they offer you a refund or future credit?
StingRay Bike w/cards in the spokes, Weeeeeee!