check engine light on on 2007 Chevrolet Impala

i had a diagonstics on my car print states my evap canister needs to be replace not sure how much this will cost one guy told me 450 dollars

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1 answer
id replace the gas cap first, then take it from there..same thing on 2001 cavalier. after new cap,you have to reset the code; just disconnect battery few minutes then reconnect.