The owner's manual has info. on how to recalibrate the TPMS:Just a quick note to let you know...
I've had false tire pressure alarms since I bought my Transit 250. I took it into the dealer and they did find that the tire sensors/computer needed calibration of sorts since the back tires take more pressure than the front.
Not sure why, but calibration needed to be done to ensure proper readings vs computer expectations.
Ford TRANSIT 2015 Owner's Manual (Page 256 of 461)
Edit 5:59 PM EST -- better link: