changed o2 sensors and reset the computer but O2 codes keep coming back?
In most cases you have four O2 sensors. You have an up stream sensor (before the catalytic converter), and a down stream sensor (after the catalytic converter). If you have a V6 or V8 you have two sensor on each side upstream and two down stream. The question is which one is bad and which one did you change.
The manual lists them as:
Bank 1 sensor 1 which is the side of the engine where the number one cylinder is and is before the catalytic converter.
Bank 1 sensor 2 is the same side but is after the converter.
Bank 2 sensor1 is the other side of the engine before the converter.
Bank 2 sensor 2 is after the converter on that same side.
Check the code again and let me know what the code is for the sensor and which one you replaced.
I also need more information on the vehicle like the year, model, size of the engine and any other information that can help me diagnosis this for you.