2000 Mercury Mystique Owner's Manual - Page 13

Instrumentation The check engine indicator light illuminates when the ignition is first turned to the ON position to check the bulb. If it comes on after the engine is started, one of the engine's emission control systems may be malfunctioning. The light may illuminate without a driveability concern being noted. The vehicle will usually be drivable and will not require towing. What you should do if the check engine light illuminates Light turns on solid: This means that the OBD II system has detected a malfunction. Temporary malfunctions may cause your check engine light to illuminate. Examples are: • The vehicle has run out of fuel (The engine may misfire or run poorly.) • Poor fuel quality or water in the fuel • The fuel cap may not have been securely tightened. 13