This light comes on when 1 or about 200 malfunctions has occured in the electronic engine and emission controls, it can be as simple as a loose gas cap to a failed fuel injector, to find out what fault code is stored in the computers memory you must have what is called an OBD2 fault code test, Kragen and Autozone do this for free.
SOURCE: The malfunction indicator light
Don't reset the battery, as it will only remove the error code but does not fix the problem. You may want to locate a store that can
check obd 1 (1995 and older).
SOURCE: Malfunction Indicator light
usually a sensor has gone bad. have it check by a mechanic on the computer.
SOURCE: What does the engine malfunction warning light indicate
the only thing the light tell you is the computers sensors have seen a problem. you need to get the codes out of the cars computer
you need the use of a scan tool
some auto parts stores will scan your car for you for no charge.
get your codes and let us know and we will help find your problem.
also when they check your codes have them erase them and see if they come back
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