The turn signal switch on this vehicle and evidently other year/model expeditions is poorly engineered causing a safety risk! When engaging the switch for signaling left or right turn, then completing the turn, upon automatic switch cancelation, often the switch will engage the OPPOSITE turn signal. Example: Right signal and complete right turn then left signal is ON. This is a safety risk because it falsely indicates to other drivers of direction of travel! Ford has 2 technical service bulletins about this...
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behavior, but have no engineering fix for this to date. They could change the switch, but this is NOT just a faulty switch, it is an engineering flaw. My suspicion is that the weight of the switch coupled with the spring that returns/keeps the switch in the neutral position is too weak. This problem can always be duplicated after completing a turn where the steering wheel is returned to center pretty fast. The fast steering wheel return is essential in duplicating the problem. The two TSBs are SSM 54692 and SSM 54446. This problem needs to be elevated to a recall (not just Ford service bulletins where Ford is doing very little to fix the root problem) as people are going to end up in an accident!