Ford Mustang Owner's Manual page 11

Service engine soon:
The Service engine
soon indicator light
illuminates when the
ignition is first turned to the ON position to check
the bulb. Solid illumination after the engine is
started indicates the On Board Diagnostics System
(OBD-II) has detected a malfunction. Refer to On
board diagnostics (OBD-II) in the Maintenance
and Specifications chapter. 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.
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.
Check fuel cap:
Illuminates when the
fuel cap may not be
properly installed.
Continued driving with this light on may cause the
Service engine soon light to come on. Refer to Fuel
filler cap in the Maintenance and Specifications
chapter.
Brake system
warning light: To
confirm the brake
system warning light is
functional, it will momentarily illuminate when the
ignition is turned to the ON position when the
engine is not running, or in a position between ON
and START, or by applying the parking brake when
the ignition is turned to the ON position. If the
brake system warning light does not illuminate at
this time, seek service immediately from your
dealership. Illumination after releasing the parking
2004 Mustang (mus)
Owners Guide (post-2002-fmt)
USA English (fus)
Instrument Cluster
SERVICE
ENGINE
SOON
CHECK
FUEL
CAP
BRAKE
! P
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