2008 Ford Expedition Owner Guide 2nd Printing (Spanish) - Page 815

Maintenance and Specifications a malfunction. Temporary malfunctions may cause the Service engine soon indicator to illuminate. Examples are: 1. The vehicle has run out of fuel-the engine may misfire or run poorly. 2. Poor fuel quality or water in the fuel-the engine may misfire or run poorly. 3. The fuel cap may not have been securely tightened. See Fuel filler cap 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 tightening the fuel cap 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. indicator remains on, have your vehicle If the Service engine soon 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 the On board diagnostics (OBD-II) description 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 375 2008 Expedition (exd) Owners Guide (post-2002-fmt) USA (fus)