There is a little suction at the oil cap but nothing to make it difficult to remove like I have read on this forum for an AOS test. I have no trouble filling the car up or smell of gas at all. As far as before the tank R and R I don't know cause I never drove the car before I fixed it. I took it to a local respected Porsche shop and they replaced the MAF and reset the CEL. It made sense that it was fixed but CEL came back at around 50 miles then I put the car away for the winter. I think The AOS is OK for the above mentioned reasons but I may change it before I take it back for a smoke test or whatever just cause I think that is the first thing they will want to do. I wonder if anyone had an AOS,with 1124 1126 codes, leak and it was fixed by replacing it though it didn't smoke or run bad.
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