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...tried a knockoff relearn button off Amazon --- FAIL.
But then, after a while (couple days, couple short drives) the TPMS self-learned. Somehow. Light disappeared and flashing error message has stayed off.
Seems 2014 F-150 stems @ 315 mhz ARE compatible with 2009 Expedition??? Btw, interesting tidbit: center caps fit. WITHOUT rear axle trim.