P0455 Twice two weeks in a row....NEED SOME HELP

[SuperDude_123]

So in short, I've pulled a P0455 from my 2005 Mazda 3 GT. At first I thought it was the gas cap, and adjusted it. Today I had the code come back, and after calling the dealer, they've said that the problem was historically due to a part that's hooked up to the gas tank. This part cost about 250$ taxes in, and I'm just wondering, how do I figure out if that's what's really wrong or if its the Solenoid Purge Valve? The car has no other code and doesn't show any problems (have driven 300+ KM since).

 

[philrab]

Sounds like solenoid purge valve, and I wouldn't be surprised to find out it's attached to the gas tank. Do you have a factory service manual?