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Can someone with more knowledge shed some light here, I'm chasing down possibly high positive crank pressure and when it comes to e90s ccv setup is it similar to e46 where it's made of 3 or 4 hoses n ccv valve?

Seen people change just the vortex breather filter valve itself and hope that fixes the issue, if its similar to e46 setup then surely it has other bits which make the entire ccv system can fail, clogged/blocked or cracked hose?

Or is the vortex breather filter valve is the whole system in itself and only part need servicing?

I have m47 320d manual if it helps thanks
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