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It means that something occurred or failed that is emission related witch if not fixed it may cause unwanted emissions into the air and it cause make you get worse gas mileage. The computer has stored a code to identify the problem, you can go to Auto Zone or Advance Auto Parts or similar parts store where they will hook up a code reader to your car & tell what code/device failed. Most auto parts stores do this for free. Then you can purchase the part & change it yourself. If you are not mechanically inclined then any auto shop will be able to take care of it for you, I would suggest getting the code read for free & buying the part yourself, then taking it to a shop for install. It would save you some money.
If you change the part yourself, disconnect the battery when you start and keep it disconnected for a minimum of 20 minutes, this will refresh the computer and allow the code to reset.
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