O2 sensor

I have changed my O2 sensor 3 time's now in 5 days and it keeps saying sensor 2 bank 2 is bad why

 

Welcome from CO! What year is the truck? Possible bad A/F mixture going on throwing a false reading? Maybe theres a problem with the harness or plug?

 

It's a 2003

 

I was told to replace the fuse for that side but can't find it lol

 

Replace sensor 1 on that side and see if it goes away. The theory is if the front sensor is starting to fail but not enough to trip a code a new rear sensor is accurate enough to detect too large of a difference in readings. If that doesn't cure it your tracing wiring or you have a bad converter.

 

I replaced it and it is looking like I have a wiring problem

 

I was having that same issue, bought the truck and turned out the O2 gasket was gone and the sensor was borderline hanging out! But the 2 mechanics I went to both said its either the sensor itself or the catalytic converters.

 

I'm not sure if it will help the original poster, but this is the experience I had recently. I had a P0138 (Bank 1 Sensor 2), replaced the sensor and continued to have problems. Read up a little on it and replaced sensor 1 and have been code free since.

 

Disconnect the battery, connect the pos. And neg. cables for a moment, reconnect. Fixed mine.