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OK, P0446 indicates that the EVAP canister shutoff valve is operating below flow limits. Normally this is caused by the purge air line (#3 in diagram) being blocked. Normally, this can be fixed by disconnecting the line at both ends and blowing compressed air thru it to clear it. If this line is clear, the only other possibility is that the flow thru the EVAP canister carbon bed is blocked, which requires replacing the canister.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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