P0455 cel
 

So yesterday went out and started my 2001 and immediately got a CEL, pulled out my little Autel and had a hard P0455 error, Evaporative Emission System Leak (Large Leak).

I changed the gas cap about 3 months ago with a new OEM one so I doubt that is the issue, any ideas on where to start? I really don't want to just start throwing parts at it.

Ive had the same issue at times.... take the cap off re seat it... clear the code and drive it again and see if it returns. It could just be dirt in the return line to the engine. Our dealer toos a compressed ait hose and blew it out and pftttt no more code.