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I can confirm, that is a bad EVAP valve. I just had this fixed a month ago, exactly the same sound. Kind of a hydraulic gas escaping type sound every now and then (mostly when coming to a stop) from the front right side of the car. Repair cost about $450.
My receipt from the dealer states the following:
"Replace Tank Vent Line for Fault Codes as per Porsche Bulletin, Part: 996.110.129.06"
I was getting running lean codes: P01124, P01126, and P0455.
Hope that helps!
-Rick
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1999 Ocean Blue Metallic Boxster - blueboxster.com
Last edited by rick3000; 11-04-2013 at 03:34 AM.
Reason: don't know my left from my right
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