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On your issue the whole valve cover to replace. i have seen kits to replace the diaphram but the success rate is about 35% . not worth the hassle.
the codes are a Pxxxx format so i need to know the entire code to assist!!
need to correct the valve cover first and then clear the codes and then road test . fyi you are talking to a dealer tech!!! the valve cover can cause all kinds of issues so lets go with the obvious and then continue then . but keep in the back of your mind of the other faults that you had!!
sure my pleasure!!
the next thing is to chekc the canister purge valve. if you follow the vac hose above the throttle body to a black valve . first see the valve is leaking (not sealing)
the replacement was just in the rear? or did you also replace the valve under the engine cover/air filter housing on the passenger side?
The valve you replaced must be installed correctly due to the fact that the valve is flow directed . if installed backwards the tank system will not work correctly.
i have a wierd question what is your place of residence? rural , city , lots of wildlife? any recent accidents?
no do not change the direction. the key is that if you live where you have alot of chipmunks or little critters that live around you.
i have a feeling on this that in the back there is some plastic corregated line that critters like to chew and nest on top of the tank. that smoke test is the next best thing to trace the leak !!! note it may be expensive if they have to drop the tank!!!..
THAT IS THE VACUUM CANSITER/LEAK DETECTION PUMP ASSY .