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2001 Boxster S Air Oil Separator

Engine

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster S; Year: 2001; Engine (type, size, modifications): standard 2001 BoxsterS; Total Mileage: 75,500; Transmission: Manual;

I have been getting fault codes P1128 & P1130. I had replaced the MAF last spring (after an earlier series of problems ). Given the history here, I have done a fair bit of research, and, I have come to suspect the AOS as a possible problem. I read that if the AOS is not leaking the oil filler cap can be loosened easily while the engine is running, but, if it is leaking, it may be hard to remove while running. Is this true? In my case, with the engine off, the cap rotates easily, but with it running, it won't budge.Thanks in advance.

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