That does sound odd.Well I would think that if someone had tried to start the truck with the wrong key that the CEL would have come on right away when you started the truck, not during the test drive.
Good points.Salesman BS. CEL would not have come on DURING the drive if someone at some other time used the wrong key. Consider waiting until a different truck comes along, they usually do. I know it's hard when the candy is in front of you though. That's how I ended up with my 09 Big Horn :drool2: