I wouldn't be so sure yours is faulty as the PCV on mine is new. For £20 in Dave's link above it's worth a punt though!

I've found a smoke leak on mine using a smoke tester which I'm pretty sure equates to a vacuum leak when it's running so I'm tearing mine down to replace gaskets at the moment. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Pcv didn't cure mine I'm waiting on a smoke machine, I've got snout bearings and coupler too so I'm expecting a similar tear down shortly

That escalated quickly. 🙈

What's gone on there then ?

Updated my other thread:

https://www.fullfatrr.com/forum/topic57991-375.html

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior