Welcome to LOC! :)
Here is a link with the codes. I can help you more then that, but others can help more. Looks to be a EVAP issue. Cheap gas cap first (easy). Could be other things like charcoal canister etc.
http://www.troublecodes.net/Lexus/[/
This might help
http://us.lexusownersclub.com/forums/index...880&hl=PO440url]
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Thanks! I'll check the site, but I'm not sure of the codes, since I got them off this site from someone having the same problem. Mine could be different, but it's a place to start. Thanks again.