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Hi, I'd get a Durametric, Foxwell, or similar Porsche specific scanner that is able to monitor all four O2 sensors on the fly. That would help you pinpoint which bank has issues and which cat is faulty, if that's the reason. I'd then go from there. Not sure though what's the requirement in Costa Rica, maybe you have the 2 cats version. Still, you need to be ale to monitor each bank separately to get an idea.
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