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Steve Tinker · 06-10-2009, 03:26 PM

BoxsterS21 - try removing the oil filler cap with the engine idling - if it is difficult to remove (ie theres a vacuum holding the cap) there is a good chance that your AOS needs replacing.

06-10-2009, 03:26 PM	#4
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	BoxsterS21 - try removing the oil filler cap with the engine idling - if it is difficult to remove (ie theres a vacuum holding the cap) there is a good chance that your AOS needs replacing.