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What is your question?
How do u know which o2 sensor to change
What makes this problem better or worse?
No symptoms really just I am getting worse gas mileage
How long has your 2005 Kia Optima had this problem?
Week
https://repairpal.com/repair-shops I really don’t understand why you want to replace an 02 sensor before proving it will be beneficial to do so. Good luck !