Service Engine Soon
If the service engine soon
indicator light stays illuminated
after you start the engine, it
indicates that the On Board Diagnostics
system (OBD) has detected a malfunction
of the vehicle emissions control system.
Refer to On Board Diagnostics (OBD) in
the Fuel and Refueling chapter for more
information about having your vehicle
serviced. See Emission Control System
(page 156).
If the light is blinking, engine misfire is
occurring which could damage your
catalytic converter. Drive in a moderate
fashion (avoid heavy acceleration and
deceleration) and have your vehicle
serviced immediately.
WARNING
Under engine misfire conditions,
excessive exhaust temperatures
could damage the catalytic
converter, the fuel system, interior floor
coverings or other vehicle components,
possibly causing a fire. Have an authorized
dealer service your vehicle immediately.
The service engine soon indicator light
illuminates when you first switch on the
ignition before engine start to check the
bulb and to indicate whether the vehicle
is ready for Inspection/Maintenance (I/M)
testing.
Normally, the service engine soon light
stays on until you crank the engine, then
turns itself off if no malfunctions are
present. However, if after 15 seconds the
service engine soon light blinks eight times,
it means that the vehicle is not ready for
I/M testing. See Emission Control
System (page 156).
Stability Control System
Displays when the
AdvanceTrac®/Traction control
is active. If the light remains on,
have the system serviced immediately.
See Using Stability Control (page 177).
Stability Control System Off
Illuminates when you disable
AdvanceTrac®/Traction. See
Using Stability Control (page
177).
Transmission Tow/Haul (If Equipped)
Illuminates when you engage the
four-wheel drive system. If the
light fails to display or remains
on when the ignition is on, have the system
serviced immediately by an authorized
dealer.
90
Expedition (TB7) Canada/United States of America, enUSA, First Printing
Instrument Cluster