There are so many different reasons the light comes on. You should use PEP Boy's or Auto Zone as a resource to check for codes stored in the computer, once found, clear all codes. There may be a code stored that need to be cleared. The fuel cap could not be sealed properly and that would set off a code. If you recently replaced a water pump or thermostat and didn't use the right "gasket sealer" that would set off a code and the light will display. Normally PEP Boy's or Auto Zone won't charge just to scan the system.
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