Thomas B Shay

I have a 2007 Audi A6 3.2L. It Smoke heavily on start up. I have three codes on it P0068, P0175, & P12A1. I have put in new spark plugs and I have replaced the valve cover gaskets. It looked good inside (no Sludge). after doing the valve cover gaskets I forgot to put the vacuum line back on the vacuum pump and it didn't smoke. after putting it back on it went back to smoking very badly. Is to much vacuum pulling oil past the rings? Does anyone know what I can do to fix my car? any advise would be helpful.

Thank you in advance.