Still getting P1131 code

Well after getting code P1131 after my longtubes were installed my tuner told me that my passenger 02 sensor was not reading and recommended i replace it.

Well i replaced both upstream 02 sensors and got some bbk extensions (ditched my home-made ones) and im still getting the code...

Any incite?? And yes i did reset the computer...

sorry i posted the thread, didnt see the other one that was related to mine...