fault code on my fathers a6 2.8 2001
16825 - EVAP Emission Control Sys: Incorrect Flow
P0441 - 35-00 - -
after searching and trying to test other things it is not the gas cap, and the car doesn't seem to have any torn vac lines or anything like that.
I also found in the search it could be the combi valve ...? is this true? if so any help as to where it is located and what it looks like?
Any other info would be greatly appreciated.
Thanks



