Well, I'm not a Ford tech, but it sounds like it is telling you there is a serial number mismatch possibly? In a John Deere Engine Control Unit (ECU), if there is a serial number mismatch in the controllers, it will derate engine performance until the mismatch is corrected. In other words, you can't swap a controller from one tractor to another because there are several controllers on the machine that "talk" to each other and each one "knows" the serial numbers of the other controllers. If there is a mismatch, the affected system goes into a derate or "limp home" mode. I don't know if the same type of thing can happen on Fords. Anybody know if this is possible? I was under the impression that there was only one "controller" on these cars?