First of all, I just want to say how much of a PITA these sensors and the whole system in general is. I received my Expedition in April of this year with this issue. When I start the truck the TPMS light will blink for about 20 seconds and then shut off. The Message Center displays "Tire Pressure System Fault". When viewing the codes of the TPMS module it displays B2872 which is "Tire Pressure Sensor Fault" so I purchased 4 Dorman 974-002 tire pressure sensors thinking that if one is dead, then the rest are probably not far behind. I get the tires broke down no sensors are in the vehicle at all. I was aggravated that the dealer I purchased this from probably didn't want to fool with them, but at least I had new ones to install. So I get the new ones installed and go to do the OEM relearn process and not a single sensor is recognized by the TPMS module. I called Dorman and they said I am doing everything correctly. I looked at the ford service manual and it shows that mine should be light blue. the current ones are black/grey. Any ideas? This thing is driving me crazy. Thanks!