It could be anything at all that is electrical or sensor-related in nature. Your car is an OBD2 car (for emissions), and it's a very strictly-controlled system. As a result, pretty much anything that fails will cause the light to come on and will store a code in the computer. Go to AutoZone and ask them to scan your computer for codes - they'll do it for free, where a dealer will hit you for up to an hour's labor. They'll tell you the fault codes, which will point you in the right direction for the fix. Get the codes that come out of the scan and post them as a reply here and we can go from there.
SOURCE: Malfunction Indicator Lamp
Take your car to your local autoparts store and have them pull the codes - this is free at most stores. Post the codes when you're done. This can be caused by anything - even as simple as not tightening your gas cap (you should hear the clicks - it doesn't damage the cap).
SOURCE: malfunction indicator lamp in my toyota corolla is on how i fix?
The check engine light also called the malfunction indicator comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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