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What porsche garage have you had it in? Was this car flooded? Or have you checked under the seat for dampness? That condition doesn't sound safe, I'd guess that it's not the immobilizer because that's usually going to be an on or off thing. Check your wiring to make sure something isn't messed up there, look at the box under the seat. Is it wet under there or any signs of flooding?
Other than that, you won't be able to diagnose this yourself. I'd take it to a dealer or someone with a Porsche PIWIS diagnostic tool. I'd imagine that's the best way to figure that out. Maybe some seasoned mechanics can weigh in.
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