Ford 2011 Econoline Owner's Manual page 157

Tires, Wheels and Loading
To restore the full functionality of the tire pressure monitoring system,
have the damaged road wheel/tire repaired and remounted on your
vehicle. For additional information, refer to Changing tires with TPMS
in this section.
When you believe your system is not operating properly
The main function of the tire pressure monitoring system is to warn you
when your tires need air. It can also warn you in the event the system is
no longer capable of functioning as intended. Please refer to the
following chart for information concerning your tire pressure monitoring
system:
157
2011 Econoline (eco)
Owners Guide, 1st Printing
USA (fus)