2004 Toyota Matrix 1.8L 4 cylinder 189,000 miles DTC's are P0442 & P0446

Have a 2004 Toyota Matrix 1.8L 4 cylinder with 189,000 miles. Have 2 codes P0442 and P0446, respectively.

Checked wiring, power and grounds were good. Checked gas cap (Not OEM, parts store Stant brand) that was still ok. Checked with smoke, no leaks anywhere other than the vent off the Canister vent hose, did see smoke dump out on that hose, plugged it off and nothing. Gas cap was pressurized as well when took it off, you could hear that pressure sound every time as well as smoke come out with gas cap off. It’s a friend’s wife’s car and was saying more than like the canister vent valve was the bad component after checking the wiring. It did come from a dusty area (Yuma, Arizona). Just was curious if I led in the right direction of my diagnosis. Thanks Levster24.