96 k1500 5.7 engine auto trans. 114,000 miles

codes:
P0154- O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1
P0155- O2 sensor Heater Circuit Malfunction Bank 2 Sensor 1
P1153 Insufficent Switching Bank 2 Sensor 1

I am assuming these codes mean the Bank 2 Sensor 1 needs to be replaced?
Would this affect gas mileage and power?

Thanks for all advice.

Check for a broken wire and then replace.

Thanks taillight for advice. Checked the wiring on the sensor, it looked fine. I will get install a new sensor in the future and post results. I may take sensor from bank 1 and try that on bank 2 to see if that works. Is sensor 2 (behind catatylist converter) the same style sensor??

thanks again

NO. They are different. Use a new one.