2010 Ford Mustang Owner's Manual - Page 288

Maintenance and Specifications 3. The fuel fill inlet may not have been properly closed. See Easy Fuel™ "no cap" fuel system in this chapter. 4. Driving through deep water-the electrical system may be wet. These temporary malfunctions can be corrected by filling the fuel tank with good quality fuel, properly closing the fuel fill inlet or letting the electrical system dry out. After three driving cycles without these or any other temporary malfunctions present, the service engine soon indicator should stay off the next time the engine is started. A driving cycle consists of a cold engine startup followed by mixed city/highway driving. No additional vehicle service is required. If the service engine soon indicator remains on, have your vehicle serviced at the first available opportunity. Although some malfunctions detected by the OBD-II may not have symptoms that are apparent, indicator on can continued driving with the service engine soon result in increased emissions, lower fuel economy, reduced engine and transmission smoothness, and lead to more costly repairs. Readiness for Inspection/Maintenance (I/M) testing Some state/provincial and local governments may have Inspection/Maintenance (I/M) programs to inspect the emission control equipment on your vehicle. Failure to pass this inspection could prevent you from getting a vehicle registration. Your vehicle may not pass the I/M indicator is on or not working test if the service engine soon properly (bulb is burned out), or if the OBD-II system has determined that some of the emission control systems have not been properly checked. In this case, the vehicle is considered not ready for I/M testing. indicator is on or the bulb does not If the service engine soon work, the vehicle may need to be serviced. Refer to On-board diagnostics (OBD-II) in this chapter. If the vehicle's engine or transmission has just been serviced, or the battery has recently run down or been replaced, the OBD-II system may indicate that the vehicle is not ready for I/M testing. To determine if the vehicle is ready for I/M testing, turn the ignition key to the on position for 15 seconds without cranking the engine. If the service engine indicator blinks eight times, it means that the vehicle is not soon indicator stays on ready for I/M testing; if the service engine soon solid, it means that the vehicle is ready for I/M testing. The OBD-II system is designed to check the emission control system during normal driving. A complete check may take several days. If the 288