P0441 Code for 2010 Mz5

Cuppycake

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2010 Mazda 5 Sport - Galaxy Gray
All,

My car has thrown this one three times in the last two months. The first time, my wife recalled having filled the tank the day before and was pretty sure she hadn't tightened the gas cap properly. The second time, it was pretty much the same, except I filled it up. Both times, I reset the code and made sure the gas cap clicked. This time (today), I noticed when I checked the gas cap that it was loose. I took it off then put it back on and turned it until it clicked, but I don't think that's going to solve anything--it didn't last time.

Any thoughts? There seems to be a scant amount of info out there, and the only FSM I can find online doesn't even mention diagnosis for a P0441.(ughdance)
 
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