that is a check engine light, CEL is the shot way of saying it. basicly the ECU has found a problem somewhere in the car. if you go to a mechanic shop or autozone(is free) they have a little palm pile tipe of thing they plug into the diagnostic port and it tells you what is maulfunctioning. Once you have the code comeback here and tell us what it is we will be able to help you from there.
sometimes these codes just pop up, for me the IAT sensor code came on today. reseting the ECU can SOMETIMES cure that light, simply disconect the black battery cable for about 45 minutes. then reconnect it. The light will be off at first, if something is wrong and its not just a fluke the light will come back on.
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