Check engine light comes on frequently with code PO455. on 2005 Buick Park Avenue

It's not the gas cap. Could changing the Canister Purge Valve solve the problem? I reset the code about 4 times per tankful of gas.

by in Saint Paul, MN on April 13, 2012
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1 answer
ANSWER by , April 13, 2012
these can be very involved and exp to guess, i rec you have it ck'd by a good mech and save time and $