2004 Ford Mustang Owner Guide 3rd Printing - Page 13

Instrument Cluster Service engine soon: SERVICE ENGINE The Service engine SOON 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: CHECK Illuminates when the FUEL CAP 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 BRAKE warning light: To ! P 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 13 2004 04- Mustang (mus) Owners Guide (post-2002-fmt) USA English (fus)