Quick question How do I turn back on O2 sensors?

[Jayz28]

I was trying to tune some on my car yesterday and needed my O2 sensors back working. They have always been off on my car and never could read the BLMs ever since it was dyno tuned. So it is stuck in open loop with no O2 feedback. BLMs stay at 128.

I always thought it is based off of temperature in the constants menu. So I dropped the closed loop temp down to near stock in about 3 tables.

I then drove my car letting it warm up and it would go into closed loop a minute or two and back to open. I'm using tuner pro to log it.

Any help is always awesome.