Sounds like just a broken wire to the temp sensor or a bad sensor. Once you find and fix the problem you still have to clear the error code to clear the CEL. I am more worried about coolant on the ground than a bad sensor. Are you sure it is coolant and not just AC condensate? Where is it coming from exactly?
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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