2000 Lexus ES300

HAVE A 2000 ES300. RECENTLY, THE CHECK ENGINE/TRAC LIGHT ILLUMINATED AND AFTER A QUICK SCAN CODE PO446 WAS DISCOVERED. I STARTED BY TIGHTENING THE GAS CAP AND DISCONNECTING THE BATTERY; THE ENGINE LIGHT CAME BACK ON AFTER A WEEK. I HAVE TAKEN A LOOK AT THE VACUUM LINES AT THE CHARCOAL CANISTER AND UP UNDERNEATH THE ENGINE COVER. EVERYTHING LOOKS OK. I DO ALL MY OWN WORK, AND I HATE BEING A 'PARTS REPLACER'. I'D RATHER SOURCE THE EXACT PROBLEM AND FIX JUST THAT PARTICULAR PART. HAVING SAID THIS, MY RESEARCH ON THIS SITE HAS INDICATED THAT THE PO446 CODE COULD BE ONE OF MANY THINGS, INCLUDING THE CHARCOAL CANISTER ITSELF, THE VSV ATTACHED TO THE CANISTER, OR THE VACUUM VALVE UP UNDERNEATH THE ENGINE COVER. FIRST QUESTION: I WAS GOING TO REPLACE THE CHARCOAL CANISTER AT EXPENSIVE WAY? DOES ANYONE HERE KNOW IF THE ISSUE BEING RECALL AND THEY CAN REPLACE NEW OEM CHARCOAL CANISTER INCLUDES THE VSV VALVE? IF IT DOES, HOW CAN I GET THIS DONE. SECOND QUESTION: DO YOU THINK I AM WAY OFF BASE WITH MY INTENTION TO REPLACE THE CHARCOAL CANISTER NEXT? IF SO, WHAT WOULD YOU DO? OBVIOUSLY, I AM TRYING TO AVOID MY DEALER AT ALL COSTS. PERHAPS SOMEONE HERE COULD HELP IN MY QUEST TO REPAIR THIS PROBLEM. *TR