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Should you discover that it's indeed an 02 sensor issue, do not replace one or two. Replace all four at the same time. I bought mine from oxygensensors.com and they were a lot cheaper than Porsche parts and they've been working great in my 97 for 8+ years now.
By replacing all four at the same time, you'll see a noticeable increase in power and performance and fuel economy... of course, this will be noticed after you drive it a couple of days and the computer can recalibrate.
BTW, Sunset Imports sells Porsche parts at 10% over their cost to customers out of state. I buy all my parts from them. Your local stealership will rape you on gas caps and radiator caps, etc. with pricing well above retail.
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