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2002 Lexus ES300 Question: What happens if the gas cap is not tightened after refueling?

 

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3SonsRepairCars, 3.0L V6, Houston, TX, June 14, 2014, 10:57
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I'm aware that the "Check Engine" light comes on, but why? And if not reset by a mechanic but ignored does this ultimately cause more problems? Does it cause failures with the oxygen sensors, etc.??

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