Hi Gloria ...
Any of a thousand things. You should check the engine. Oil OK? Coolant OK? Beyond that, it could be fuel pressure, vacuum, fuel system leak of some kind, et al. You will need to get the code to find out what turned the light on. Best place to get this information if from your regular mechanic who has a scan tool which will plug into your cars OBD II (On Board Diagnostics, second generation).
Thanks for your interest in FixYa.com
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