P0446 evap code

My wife’s car keeps throwing this code. No other issues, but it prevents us from using auto start which is annoying. I saw one part I could change and it was cheap so I ordered it and then realized I’d basically have to remove the whole rear end to do it. are there any ways I can track this down to prevent disassembly? I don’t want to do a 3 hour job if I don’t know it’s actually the issue.
 

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