After removing the valve cover to try the above suggestions, I realized it was such a pain in the ass that I wasn't gonna do it again. So, I ordered a new valve cover...aka nearly $600 PCV valve. A week later I reinstalled it. That was a month ago. No more codes.
Audi 2.7T engine found in B5 S4 & C5 A6 + Allroad Notorious for oil leaks from valve covers + cam/crank seals, very high operating temperatures (causing cooling issues), various sensors failing way too early, complex to work on, tight fit especially in B5 S4.
Mine smoked like crazy and was using about 1 quart per 100 miles, which for the previous owner caused engine failure. I rebuilt the motor and used the old valve cover and ultimately had the same issue. Replaced the valve cover and it hasn't used a drop of oil over 6000 miles.
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The brand is registered in Germany.
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