John, Last fall I discovered I had the same problem on my 2001 Rialta. I was about to leave on a 500 mile trip so I made a quick modification by removing the VW PVC valve from the assembly and fabricated a replacement.
I was very easy. I replaced the VW PVC with a standard BALL TYPE PVC and used 5/8 heater hose, (2) 90 degree abs fittings and hose clamps.?I just cut the hoses and fittings? to fit.
Keep in mind that the VW PVC is vacuum operated so PLUG THE HOSE and the replacement PVC is gravity/pressure operated so the PVC MUST BE VERTICAL(valve closed to the bottom).?
For those negative geniuses out there that are about to say that this is a bad idea because the crankcase pressure will not be correct. The slight variation will be insignificant.
Sorry I did not take pictures as I was in a big hurry and when I had it all fitted I left on my trip. Absolutely no codes in a 500 mile trip when previously I would get a code in less than 100 miles.
John, Due to Canadian travel restrictions I can not access my R but if if you want to discuss this further you can contact me at
gundylake@... can guess the rest
