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Start from square 1. Plug in an OBDII reader and read out the codes. It could be 100 possible reasons but error codes will narrow the field. If you need a second opinion from a qualified Porsche tech in SD let me know. There are several highly qualified shops there.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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