@SimplySuperb Hello. I have the same engine and also saw that I have a small leak from the oil filter cap. I did a vacuum test. When the car is cold, at idle RPM, the vacuum is very strong, but after 5 minutes, when the RPM goes down, the vacuum is very small. I have read that this is normal for the vacuum. Could you please check if you still have vacuum after you replaced your PCV?

@NDW89 mine had that and still has vaccum the same way as you describe, my problem was that it made a whistling noise which dissapeared when i oppened oil filler cap. Also in cold weather i had a lot of white smoke from the exhaust which reduced substantialy after pcv change.

UPDATE:

Problem solved by changing haldex pump and clutch assembly. All was done under warranty. Test for this was to remove the haldex fuse from under steering wheel and do a test drive, which i have found on other forum. My haldex pump filter inside was filled with debris (as factory procedure does not include cleaning of the filter located on the pump, that caused pump motor to burn out and draw a big ammount of current but not enough to burn out a fuse. My haldex clutch plates were severely deformed and were binding even when the fuse was removed creating physical resistance which triced tcu and ecu.

Reccomendation on various internet pages say that this pump filter should be cleaned every haldex service, to ensure that it does not end up the way my did.

Very happy with the car now, such a shame it took so long (8 months) to sort out, thank you everybody!