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It might be a bad sensor, or harness, or heating circuit, or DME. Further diagnosis recommended. The simplest approach is to swap sensors and see if the error code moves to the other side. If it does, it's the sensor.
From Renntech:
P0134 Oxygen Sensor Ahead of TWC, Bank 1 – Interruption of Signal
Possible causes:
Open circuit in signal wire or ground wire
Oxygen sensor heating not functioning
Output stage in DME control module faulty
Internal resistance too high
Check:
– Wiring harness
– Oxygen sensor
– DME control module
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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