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Thanks for your suggestions.
A Porsche tech mentioned that a failed crank sensor will typically kill the engine while it is running and leave you stranded mid-trip. Up to this point I have not had that symptom.
Interesting note about the coolant sensor. I have noticed that the coolant temp guage is not reading as it should be once the car is 'hot'. Could be a failing thermostat (replaced 50K ago with the water pump). Both were coming due for replacement anyway, but I wouldn't have thought to replace the sensor at that time too.
The tech suggested starting with the relays located in the trunk as sometimes they can get hot and stay closed once they cool down. I'll start with the DME and coil relays.
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