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Originally Posted by Topless
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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I don't have the 22mm socket with the slot in it yet. But I ordered one from Harbor Freight today.
I'll try the sensor swap as soon as I receive it.
Thanks.