In last month or so I have been getting whole bunch of P0440 codes (probable about 20). I thought that the gas cap was the problem, so I bought a new one. However the problem continues. Then I thought that it was a vacuum leak between the evap valve (or whatever it's called) that sits on top of the driver's side valve cover. But the vacuum line seems to be connected. The car runs great, but the SES light keeps coming back few days after I reset it. Any other things I should look at? I will try to find if there is any other vacuum leaks, but where do I start. I would really hate to take the car into the dealer (got cam and other things).

Thanks for any help.

 

you might also post in external engine for help on this. this gives you a ttt.