02 sensor bank 2

That's not enough information.. Post the actual code number .. That's what is needed to determine next step, and correct answer!

Bank 2 sensor 2 is the bank2 downstream o2 sensor. 1. Determine which bank os bank 2 (typically number 1 cylinder is bank 1) and sensor 2 is the after cat converter sensor. The other issue is to ensure you have good power and ground for the heater ckt for the o2 sensor. If you have good power and ground you may possibly be replacing the wrong sensor.