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I've had to replace the O2 sensors in both of our Mercedes. The mechanic who cares for the cars says there is a 99% failure rate on these, typically between 75-100K. Don't know if that is the case with the Porsche. One thing I found odd is that both times I was stranded with the problem, the engine just stopped -- as was your situation -- but then it would start if I let it sit for 30 minutes. It would start up perfectly again. Learning that saved me some towing money. Worth keeping in mind -- or at least trying if you have this problem again.
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