I have not changed anything in the tune, so unless it reprogrammed itself, it should still be set for closed loop. Plus it was working fine before the issues all started.
I'm thinking all the time I have spent trying to diagnose the issue and it running rich and dumping fuel into the exhaust, then setting for a few weeks between times running, has probably killed the sensor. I know raw fuel is not good for them.
I am going ahead and ordering a new sensor anyways, they are not very expensive, but will double check the power, ground, and sensor wire in the meantime.
I found a good price on the sensor on ebay for $14.99 with free shipping.
Looks like it fits several chevy and GM vehicles. I went ahead and ordered two, to have one as a spare.
https://www.ebay.com/itm/325453630014
Not sure if anyone else has a vehicle that uses that style, but figured if you did, here is a decent price on them.
NTK 21003 is the part number.
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