2008 Ford Mustang Owner Guide 3rd Printing - Page 264

Maintenance and Specifications On board diagnostics (OBD-II) Your vehicle is equipped with a computer that monitors the engine's emission control system. This system is commonly known as the On Board Diagnostics System (OBD-II). The OBD-II system protects the environment by ensuring that your vehicle continues to meet government emission standards. The OBD-II system also assists your authorized dealer in properly servicing your vehicle. When the Service indicator illuminates, the OBD-II system has detected engine soon a malfunction. Temporary malfunctions may cause the Service engine indicator to illuminate. Examples are: soon 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. 264 2008 05+ Mustang (197) Owners Guide (post-2002-fmt) USA (fus)