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With the immobilizer on my Audi (Bosch based as well), the starter would still crank the engine over, but the engine would fire for a few revolutions, basically a split second, and then it would die. The ECM woudl throw an immobilizer code.
I don't know how the Porsche immobilzer works but if its the same at the Audi and your engine won't crank, then the issue isn't with the immobilizer but with the starter circuit.
In any case, further diagnosis is a waste of time, and potentially harmful without having the factory wiring diagrams for reference.
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