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P0154, P0155, P1153 - What do these codes mean? And what exactly do I need to do to fix it?

I have a 2000 chevy blazer and these codes came up in the failed smog check summary: P0154, P0155, P1153. I just want to know what they are and what parts and where can I find the parts in the vehicle to replace them? The codes say it's bank 2 sensor 1 on all the trouble codes... please help.
Answer:

Trouble codes P0154, P0155, and P1153 have to do with your Chevy Blazer's Oxygen Sensors. We recommend having a smog check repair station conduct a fuel system feedback test to ensure your Chevy's oxygen sensors are working properly. This includes ensuring the oxygen sensors are working properly, your Blazer's emissions computer is receiving the signals from the oxygen sensors, the computer is computing the data properly and sending the correct signals to the fuel injectors to either increase or decrease fuel delivery to the combustion chambers. The feed back test will utilize a 5-gas analyzer (usually a smog machine) and propane. The smog technician should introduce propane to the intake system and ensure the oxygen sensor is reading this introduction as an increase in CO, and ordering the computer to decrease fuel delivery at the instant propane is added to the system. This test should be done after the engine has sufficiently warmed up and while it is running at idle. If no change in fuel delivery is seen we know we have a feedback problem. Then the diagnose should turn to which part of the feedback system is defective. Using a voltmeter the technician should observe the voltage output of the oxygen sensor as propane is added. Voltage should increase. If there is no increase we have a defective O2 sensor. The sensor should be replaced and the test started over. If voltage increase is present at the sensor output the technician needs to ensure voltage increase is also present at the computer input terminal. If voltage is present at the terminal as well next the smog technician must ensure the computer output terminal to the fuel injectors are lowering "injector pulse rates". posted by SmogTips Support

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