P0449 is a fault with the vent control solenoid and not canister.
P0445 could be a resultant of P0449. Here is how you replace the vent control solenoid. Also inspect the vacuum feed tube O rings they may need to be replaced. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
Images (Click to enlarge)
Monday, August 20th, 2012 AT 10:41 PM