I have a 1996 GMC truck that has a p0154 code

Question:

I have a 1996 GMC 350 truck that has a p0154 code replace the o2 sensor.It was bank 2 sensor 1 replace. The code came up the same what could it be?

Answer:

The computer is not seeing any action from the drivers side front oxygen sensor. Either you changed the wrong sensor or the wire from the sensor to the computer is damaged somewhere.