Hi there I recently replaced 3 O2 sensors on my 2007 Chevrolet Tahoe. One of the O2 sensors was excessively bent and caused a direct short and blew a fuse. I replaced all the ones that I could’ve easily accessed. The first one on the upper side of the catalytic converter on the driver side is the only one I was unable to reach not going to lie. I really wanna Will Smith slap whoever designed this truck, but anyways, after replacing all of those three sensors and resetting the fuse sometimes when I start up the truck, I get a check engine, light with the same exact code as the one that I fixed, the O2 sensor heater circuit could be any reason why this could still be happening most of the time the check engine light doesn’t come on but I’ve noticed it comes on more frequently when it’s cold outside or when you start the vehicle after it’s been sitting for a day.
Old Broken O2 Sensor

This is the broken o2 sensor

 

Welcome from Florida. P0054 is for sensor 2 bank 1. Is this the one you didn't replace? If it is then you should replace it.