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Understanding your Tire Pressure Monitoring System (TPMS)
The Tire Pressure Monitoring System measures pressure in your four road
tires and sends the tire pressure readings to your vehicle. The Low Tire
Warning Lamp 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. Visit www.checkmytires.org for additional information.
When your temporary spare tire is installed
When one of your road tires needs to be replaced with the temporary
spare, the TPMS system 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. This includes the optional full-sized matching spare wheel
and tire, as it is intended for temporary use only.
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:
2009 Grand Marquis (grn)
Owners Guide, 1st Printing
USA (fus)
Tires, Wheels and Loading
150
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