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OK, signal implausible codes mean you have an open circuit in all the sensors listed. Could be a damaged wire harness, failed sensors or failed DME. These codes definitely indicate a car that runs like poo.
Advice: Stop driving/running the car and isolate and test every listed sensor. Maybe a rodent got in there and chewed things up or a harness got too close to a shiny new set of headers and melted. If you don't know how to do this process, find a good local indy who does. Continuing to run the car might just kill it.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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