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Rather than starting to throw money at the problem, I'd suggest you find a competent independent shop that KNOWS 996's and start there. I would say you didn't get a PPI to start with and fell victim to the code clearing tactic which resets itself and then collects data after driving a couple hundred miles. Indicate your location in the country and you might get a recommendation for a reputable shop.
BTW, look inside your coolant tank and make sure it only has coolant in it.
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Tony G
10 Porsches come & gone!
1962 Morgan Plus 4 
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