Clutch vacuum vent valve

[Tj 0785]

I'm getting fault codes
17947
P1539 clutch vacuum vent valve implausible signal . Is this the clutch switch( which I changed a few month a go or something else if so what? I've looked on parts data and can't see any vent valves

 

[badger5]

a what?

 

[Tj 0785]

A quick google (the other source for VAGCOM codes ;P) came up with this...
P1539 Clutch Vacuum Vent Valve switch - implausible signal

Not even sure where that is but look for a switch somewhere around the clutch mech for a start..

<tuffty/>

 

[Tj 0785]

Google just seems to just show up clutches or air vent's