It is letting you know there is a problem going on that needs attention. You take it somewhere to have the code, codes read by a scanner that points you to a direction of a fix. Once the problem is fixed, the mechanic with the scanner will reset the light. If you just have the light reset with no fix, the light will just come back on.
Most auto parts stores will scan the computer for free. Post the codes you get here and we can help further. HTH. -Jim
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