The CES I am getting is the P0455 gross evap leak. I've read all the posts about this issue and nothing is really helping. I've also heard that the gas cap is never the culprit is this true? And I was also wondering if the 160 dollar purge valve is the only one I can use for my B205R. Because I see there are other purge valves for alot less money, between 30-60 dollars. What is the difference between the purge valves? Because the price difference is very large. Thanks in advance for the help.