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The car is running lean. Probably either an intake air leak or failed MAF. Each O2 bank sensor induces independent fuel trim so it is possible to get one code on Monday and a mirror code on the other bank in a few days. You are on the right track.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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