Ford 2013 MUSTANG Owner's Manual page 96

Service Engine Soon
The service engine soon indicator light illuminates when the
ignition is first turned to the on position to check the bulb and
to indicate whether the vehicle is ready for
Inspection/Maintenance (I/M) testing. Normally, the service engine soon
light will stay on until the engine is cranked, then turn 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 the Readiness for Inspection/Maintenance (I/M)
testing in the Fuel and Refueling chapter.
Solid illumination after the engine is started indicates the on-board
diagnostics system (OBD-II) has detected a malfunction. See On-board
Diagnostics (OBD-II) in the Fuel and Refueling 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 by your
authorized dealer.
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.
Speed Control (if equipped)
The speed control system indicator light changes color to
indicate what mode the system is in:
• On (amber light): Illuminates when the speed control system is turned
on. Turns off when the speed control system is turned off.
• Engaged (green light): Illuminates when the speed control system is
engaged. Turns off when the speed control system is disengaged.
Stability Control System
Illuminates when the AdvanceTrac®/Traction control is active.
If the light remains on, have the system serviced immediately.
2013 05+ Mustang (197)
Owners Guide gf, 3rd Printing
USA (fus)
Instrument Cluster 95