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I have a 98' Boxster 2.5 with 75,000 mi. Since purchasing it a year ago, the CEL has come on about once every 8-10 wks with the P0446 code, often shortly after a re-fueling. I've replaced the gas cap, made sure it's tightened properly after each re-fueling, had the vacuum system checked by my Porsche mechanic, no problems showed up. Today the CEL (with the same code) appeared again. Does anyone have any insights as to what may be going on? Thanks.