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Was it rainy or humid that day? If yes, check the coil packs and do a visual inspection of the coil pacs.
If they have cracks that doesn't mean that they are bad. Mine had cracks but they worked. Replaced them all precautionary and sold the crack fee ones on ebay.
Did you check the spark plug electrode distance when installing the plugs? Are the spark wires 100% connected?
What tool did the workshop use to read the codes? Porsche specific or generic OBD2?
Regards, Markus
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