ITS25

Alright, I've had this code for a few months now and I can not find the problem. I have a problem with low idle and loss of power. I am all out of ideas and I need help to fix this. When I pull the CEL code it comes up as a bank 1 02 sensor so I replaced the pre-cat 02 sensor. Well that didn't get rid of the code so I replaced the MAF sensor, and that didn't work. I have replaced vacuum hoses and checked for leaks and everything is sealed tight. I am out of ideas and running out of money. Does anyone have any ideas to get rid of this code besides breaking the bulb for the CEL? Any help would be greatly appreciated I need to get this fixed.