o1 voyager check engine light

My voyager just set 2 problem codes P0442 and P0455 I have replaced the fuel cap and the 2 small sections of hose at the schrader valve for the smoke test just to the left of the engine. Does any one else have any suggestions on this. The van has 80000 miles and still runs very good and everything except the passenger window which needs a new motor works. I really don't want to take this to the dealer and pay there 80-90 dollar an hour rate. HELP!!

Check all the rubber hoses under the van for cracks. Especially around the charcoal canister!