First of all, a flashing check engine light is not good, your manual will tell you to stop running the car when this happens and tow it to a shop geared to handle Porsches.
Without knowing what codes are thrown, anything would purely be a guess. Stop using the car, get the Durametric and scan it, only then will you know how to proceed.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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