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I noticed an issue with my Cayenne base 2014 V6 958: when in park, it idled up and down to 1500 rpms and normal. It only happened once then the next day, the CEL came on. I codes were System too lead at idle Bank 1 and 2 (P218700, P218900). I researched the issue and found that similar situations could be caused by fault air oil separator. I tried to find the location for the AOS but found one thread on Rennlist that there is no AOS on the Cayenne V6. At this point, I could not find any leaks in any of the hoses so I took it to a independent shop. Well, I just heard back from them saying the issue is with the AOS and it's a $400 part. So question is, does the V6 958 have an AOS. If not, what is this $400 part they're going to replace. 

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Valve Cover with Crankcase Vent Valve?

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The V6 Cayenne has an AOS built into the valve cover itself, much like the 3.2L Audi engines.  It has a diaphragm in it which can fail. I believe Porsche does not sell these parts anymore (955.110.765.00 Valve crankcase bleeding), only an new valve cover with it built in for around $360.  I understand that there are aftermarket rebuild kits for these now.  UPDATE:  I stand corrected, part is still available for around $260 from board sponsor Sunset Porsche.


PCV Valve - Porsche (955-110-765-00)



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