Weirdest Notification for Check Engine Light

in my25 years of driving i never let anybody filled gas for me even once, i hate when somebody is messing with with my car.
 
I had that same CEL issue in my car just a few weeks ago.

The weird thing was that I had burned through 3/4 of a tank of gas (about 7 days) with the cap off before the light came on. And when I replaced the cap and filled the tank, it took 3-4 days for the light to go out.
 
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