PCM Diagnostics & Tuning - HELP, with O2 sensors

Hey guys I need your help, like many of you I got SES light on and found out it was caused by a bad o2 senors on the front passenger side, my question is do i replace both of the front sersors or both of the sensors on the passenger side, help please I need to pass my smog check.

alright, what are the codes? then, what have you done to your car? then what was the last mod you did to your car before this problems?

DO NOT , PLEASE DO NOT BUY VETTE REAR OXYGEN SENSORS, its a waste of money and doesn't fix a damn thing

The code will tell you which one it is. Post it if you have it, and any mods too...

Its a 99 trans am that I just bought that is completley stock,I dont remembergetting a numerical codes the scanner stated it was bank 2 sensor 1, the reason im asking is because I know that other users had gotten a SES light after they replaced only 1 senors so im trying to avoid that and replace them in 2's but I dont know if I shoud do the 2 front ones or the 2 rights ones any idea ? Thanks for your replys.

Bank 2, Sensor 1 is the precat (front) sensor on the passenger side. If that was the only code just replace/check the wiring on that sensor.

thanks a lot im going to replace the sensor and hopefully that pesky SES light stays off.