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I noticed the Check Engine Light in my car last Thursday when my gas tank was 80% empty. I filled the gas tank full and tightened the cap all the way. Then I drove the car for the next 3 days with the CEL on. This morning when I started my car, CEL was finally gone ! So, it was indeed related to the gas cap. I always tighten the gas cap to the point that I hear a click. But it looks like not enough. We have to tighten the cap all the way so it can't be tightened any further.
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