I tested the o2 circuits and I'm reasonably confident that I'm looking at a bad o2 sensor. Not gonna swap them around when new GM sensors are $28 a piece and getting them out is most of the trouble. The sensors on there look very old so they should be replaced anyway.Swap front oxygen sensors from driver to passenger side and passenger side to driver side. See if the issue follows the sensor. If so, replace sensor. If not look for wiring issues and such.
Sent from my HiDiNg PlAcE
Attempted to replace them today. Bank 1 came out without any drama, new sensor installed and connected. But the Bank 2 sensor ****** up the bung out on its way out. Tried to straighten out the threads by installing the new o2. No luck. Now I have a bung and a new sensor both with ****** up threads. Pain in the ass.
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