How to replace the oxygen sensor O2 Bank 2 the code reader gave code for sensor

What is your question?

It happens almost all the time in stop and go traffic. And sometimes the rpms jump up really high with out pressing gas pedal

What makes this problem better or worse?

It hesitates some time when i stop and then go

How long has your 2003 Kia Optima had this problem?

3 months