Hi I am getting error code p0442 I’ve done most of what is suggested and keep having the error code come back.

I’ve had all these parts replaced: gas cap, purge valve, n75 west gate frequency valve. I also had the alternator replaced. All at the suggestion from my mechanic...

I feel like my mechanics can’t figure out the issue and they keep singleing out specific parts telling me I need to replace them, but yet I’ve had them replace the parts above like they advised to me and still the codes comes back for a small evap leak.

Does anyone know what my issue might be? I can’t keep throwing money at parts if they’re actually not the problem as I already spent about $1000 to have the above parts replaced.