Does the skoda octavia 2004 mk1 l.6 has a pcv valve? 

Well, I was looking for the answer to the same question.
I am still not sure about it, but I believe that the pcv should be incorporated to the intake hose. The part which connects to the oil filler pipe to the intake hose.

I am not 100% sure, though.

 

Find the pictures below.

I think you are right @zsolt_kristo.

There is a valve along the intake hose. Should the valve allow fumes one way? Which way? I would like to find out a way to test this. Thanks