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Same thing as any other car, your on board computer has detected a problem with the emissions control system or other engine controls. Have the OBD codes read to determine the problem

In addition, if the cap on your gas tank has not been closed properly or has been left open when last filling your tank, may cause a pressure difference, which can also cause the engine light to turn on. From experience, even after properly closing the cap, it may take a while for the light to turn off (my guess is that it takes a while for the internal pressure to adjust).

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Q: What causes the engine light to come on 2004 Mazda 3?
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