Im getting the code on bank 2 sensor 1.. Am I losing horse power from this!?

 

I fixed the o2 sensor.. But when I bought this thing back in 06i could shred the tires like nothing..now it won't spin then if I try to.. I punch it on a dirty road and it has no low end power but wgen I reach about 3000 rpms it starts to burn them up.. I can't even power brake on a dirt road rpms go to 15-1700.. And it just bogs and sucks.. No power.. I was hoping the o2 sensor would solve this...

 

Completely stock.. Runnin 20s from a 2009 avalanche with 275-55-20 tires

 

If the sensor is bad then that could be your problem. Precat o2 sensors are very important.

 

Well I replaced it (02 sensor) and its still hurtin.. its sad that I can't power brake on a dirt road.. Just sayin

 

If you replaced the sensor and cleared the code, the PCM has some relearning to do, since the memory was basically "reset". Drive it like you stole it for a few hundred miles and it should start running the way it used to.