Mercury Mountaineer 2009 Owner's Manual page 674

Tires, Wheels and Loading
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:
Low Tire Possible
Pressure cause
Warning Light
Solid Warning Tire(s)
Light under-inflated
Spare tire in
use
TPMS
malfunction
244
2009 Mountaineer (mnt)
Owners Guide, 1st Printing
USA (fus)
Customer Action Required
1. Check your tire pressure to ensure
tires are properly inflated; refer to
Inflating your tires in this chapter.
2. After inflating your tires to the
manufacturer's recommended
inflation pressure as shown on the
Tire Label (located on the edge of
driver's door or the B-Pillar), the
vehicle must be driven for at least
two minutes over 20 mph (32 km/h)
before the light will turn OFF.
Your temporary spare tire is in use.
Repair the damaged road wheel/tire
and reinstall it on the vehicle to
restore system functionality. For a
description on how the system
functions, refer to When your
temporary spare tire is installed in
this section.
If your tires are properly inflated and
your spare tire is not in use and the
light remains ON, contact your
authorized dealer as soon as possible.