My '00 Boxster is having the same hot start problem. An independent import mechanic told me it was the ECU and to take it to the dealership. The dealership just took a look today. They refuse to change the ECU because they cannot be sure that is the problem... surely they have a way to know if it is bad without it throwing a code? There is another Porsche sitting there for 2.5 months with the same problem. I'll buy a crank shaft sensor and figure out how to swap it out myself. I am so frustrated with this car right now. At any rate, the dealership is still diagnosing.
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