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P0154
Oxygen Sensor Ahead of Catalytic Converter (Cylinders 4 - 6) - Interruption of Signal
This sounds like a bad sensor, bad connection, or rodent chewed sensor wiring. Check your O2 sensors. If they are OEM Bosch and your connections are tight, look for damaged wiring. The car is probably safe to drive if your CEL is not flashing but get it sorted soon. It is running on default mixture settings which look like they are too lean. Running for a long time like this may damage your motor or cats.
Possible bad MAF, bad AOS, intake air leak, O2 sensor wiring... time to dig in and apply the process of elimination.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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