I just got a P04FC code and its a crankshaft ventilation problem. Its a 2019 TD6 and i saw on the range rover forums someone said it was the line on top that got chewed up but I checked it and it seems fine. Anyone have any intel on next steps of diagnosing it. I recently did an oil change but I checked and the filter and oil cap are tight so I have no clue whats wrong with it.
Any Adivce?

 

Have you ever removed your intake and cleaned it??
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I have done it once there was a lot of carbon build up and i didnt fully remove the intake to do it. Would there be something correlated with that.

 

Definitely need to completely remove it. I am not sure that it would cause it, but it could affect it.

The PVC hose itself could be cracked. It runs across the back of the engine.

Smoke test might show it.

 

Check for damaged wiring and hoses too. While I was looking for your code I found a couple stories of mouse damage. A buddy of mine recently had mice fine a way into his daughter's Kia and chewed up the whole under-dash harness. The joys of soy-based plastic wiring...

 

does anyone have images or diagrams of the pcv system can’t find any for the life of me. I just want to know if I’m looking at the right stuff.

 

maybe this will help

 

Exactly what i was looking for thank you so much. i will update after i check it today afternoon

 

So quick update now. The check engine light went away itself been driving past 2 days plenty of km and it didn't come back. i looked under at the pressure seonsor vacuum line and connectors and all looks good. The big main line I have not checked but I think it's ok if the light comes back ill dive in deeper.
Thanks for all the help

 

Update: I did not see any more damaged hoses or wiring linked to that image at all. Verdict is to replace the oil seperator and just hope it's that anybody know how to diagnose a bad oil seperator or should i swap it and go from there.