P0441 fault code AP Emission Control Sys: Incorrect Flow Advice please

[A3Craig]

Engine light come on, put it on vcds and it came up with P0441 fault code AP Emission Control Sys: Incorrect Flow, done a search on here and found you can test it with vagcom so did that and it passed, cleared the code all good then next day its back on, is there any way of physically testing the n80 valve? or any other parts?
any advice would be appreciated, trying to get the car up together but the list keeps growing and ive only had it for about 10days

thanks craig

 

[mike foster]

This may be of help if you haven't seen it before :- 16825/P0441/001089 - Ross-Tech Wiki

 

[A3Craig]

Thanks and yeah have looked already and tested the way it says and it passes and it just say could be blah blah blah so wanted to know if it was possible to check other parts rather than just throwing money on parts
thanks craig