Push both tabs with your finger and pull it off. It's not right but should be snug do to the o ring making it seal. Make sure you slide it all the way on. If you changed all of that and still having problems you should have a smoke test done.
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Also could be a dirty or faulty MAS air sensor I was getting the p0172 code to rich and was the mas air sensor was at fault. For the other check evap for cracked lines and filler neck for leaks and like you said the pressure switch.
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Yeah I'm getting the same code and did the same fixes well purge solenoid I did waiting for the gas cap. If it still come on after that. The next thing will. Ring to have a smoke test done. Also check all of your evap lines and make sure not cracked and check your filler tube too. You never...
Just wanted to say hi to everyone. Just added a 2006 cobalt lt to the stable. Love the little car. I'm a Chevy fanatic have a 2003 s10 I run on the strip and around town and a 2015 and 2016 Malibu. I love them all[emoji41]
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