If im throwing codes for rear o2's(bank 1&2, sensor 2) is my car dumping fuel to compensate?

 

What are the codes? No way of knowing what it's doing with out those DTC's...

 

P0160 and P0140

 

To the original question: With ZERO activity, I would think the PCM would stay like it was. However, those GM guys are always thinking.

What incident turned off/unplugged the rear O2's?

Sims would work, but tuning the rear O2's out or limitting their ability to throw unnecessary/unwanted codes is better.

 

would i pass a obdII readiness test with the codes deleteted

 

The rear o2's are only used by the pcm to monitor the efficiency of the converters, they are not used to alter stft or ltft.