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+1 JFP
O2 sensor heating is most often a wiring issue (rodent damage, chafe, fried wiring touching aftermarket headers). I am also in the "never splice a sensor" camp. For a few extra bucks you can get sensors that are configured correctly for your car and they are plug-n-play. A few ohms due to resistance in a splice can have significant effects on how the car runs and I have seen way too many poorly spliced sensors that promptly came apart once the exhaust system heated up. A proper O2 sensor splice can be done. I just don't ever see them.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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