Hi,
Here's a few links that might be helpful:
98 Porsche Boxster Blue Smoke Start (ralegen had some good pictures)
97 oil sperator (delirious also has a good link and some hints of his own)
How to remove/install oil seperator (Blink has a write-up)
Also, after clearing the codes, in my experience, it's a normal occurence. (e.g., after I changed out all four of my O2 sensors). Maybe a few of the other folks out there can give you some input.
Anyway, good luck with that! Hope the links are helpful!