FORD 2002 Mustang v.1 - Manual (Page 12)

Light turns on solid:
Temporary malfunctions may cause the light to
illuminate. Examples are:
1. The vehicle has run out of fuel.
2. Poor fuel quality or water in the fuel.
3. The fuel cap may not have been properly installed
and securely tightened.
These temporary malfunctions can be corrected by
filling the fuel tank with high quality fuel of the
recommended octane and/or properly installing and
securely tightening the fuel cap. After three driving
cycles without these or any other temporary
malfunctions present, the light should turn off. (A
driving cycle consists of a cold engine startup
followed by mixed city/highway driving.) No
additional vehicle service is required.
If the light remains on, have your vehicle serviced at
the first available opportunity.
Light is blinking:
Engine misfire is occurring which could damage your
catalytic converter. You should drive in a moderate
fashion (avoid heavy acceleration and deceleration)
and have your vehicle serviced at the first available
opportunity.
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.
Instrument Cluster
12