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Strange, P0171 and P0174 aren't typical Porsche CEL codes. What did you read them with? They are very generic codes that Porsche doesn't typically trigger. I wander if your code reader was wrong? I would post the information into a new posting so others see it. According to my OBDII manual, 171 isn't listed, 174 is listed but refers to other codes and says perhaps cam shaft adjustment needs to be performed. Usually codes are more specific about what is wrong.
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