2 people reported this problem
Check Engine Light With Codes P0440, P0441, P0455, or P0456 on Lexus RX350
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2010 Lexus RX350 85,000 mi, Visitor
code of p0456, performed evap system smoke test. leak found at vent valve on charcoal canister. vent valve working electronically but not physically closing. ocst $1345