help o2 sensor

how do i tell which o2 sensor i need to change, i get p0141 on my code reader and it is bank 1 sensor 2, there is one befor the cat and one after the cat. please help. oh ya i have a 2001 montana 3.4l
thanks
thomas

That would be the one after the Cat. Just because you have the code doesn't mean the sensor is bad. That code is for a malfunction in the heater circuit for the O2 sensor. It could be a bad sensor or could be bad wiring to the heater. I guess you could take a chance and change the sensor, but it may not be the problem.

I like rolling the H02 sensors from bank 1 to bank 2.

" like rolling the H02 sensors from bank 1 to bank 2. "
There's only one O2 sensor before the cat and only one O2 sensor after the cat.

Is there a fuse on a Heated O2 sensor?

The exhaust probably burnt your Ho2 sensor wires.