Removing bank 1 sensor 2 oxygen sensor

What is your question?

I’ve got an engine code that points to my bank 1 sensor 2 oxygen sensor. I’ve located the sensor under the car just before the catalytic converter. It sits just before a j in the pipe that comes down from the engine and the piece attaches to the rest of the exhaust right behind it with 3 bolts. I have the o2 socket set with the offset opening for a 3/8” drive ratchet, I can’t get the ratchet extension on except at an angle with an elbow. I have sprayed it to unseize it, several times, I’ve started to remove the pipe at the triangle connection but one bolt’s placement I can’t get enough leverage. I have tried everything under the sun for the past 3 weeks and can’t get the sensor out. Am I missing something, am I doing something wrong, I’m literally stuck.

What makes this problem better or worse?

N/A

How long has your 2016 Nissan Maxima had this problem?

3-4 weeks