FORD 2013 E-450 v.1 - Manual (Page 264)

Understanding your tire pressure monitoring system
The tire pressure monitoring system measures pressure in your four road
tires and sends the tire pressure readings to your vehicle. The low tire
pressure warning light will turn on if the tire pressure is significantly low.
Once the light is illuminated, your tires are under-inflated and need to be
inflated to the manufacturer’s recommended tire pressure. Even if the
light turns on and a short time later turns off, your tire pressure still
needs to be checked.
When your temporary spare tire is installed
When one of your road tires needs to be replaced with the temporary
spare, the TPMS will continue to identify an issue to remind you that the
damaged road wheel/tire needs to be repaired and put back on your
vehicle.
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 a
TPMS in this section.
264 Wheels and Tires
2013 Econoline (eco)
Owners Guide gf, 1st Printing
USA (fus)