Gas cap warning light problem

[wwu123]

Thanks for the comments. I do have a OBD reader that shows the error code is P0442 Evaporative System Small Leak, which seems to be the one caused by loose gas cap, but also if there's a faulty seal or leak.

I do have the CPO warranty after I pass 50K miles, do you know if these parts and repair might be covered under the CPO warranty (less $50 deductible)?