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2007 Kia Rio Question: Why has my mileage dropped from 410 miles a tank to 230 miles a tank?

 

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Kakarot88, 1.6L 4 Cylinder DOHC, Thorndale, TX, September 09, 2013, 07:09
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My check engine light is on. I know that is a bad oxygen sensor. I think the cataletic converter is failing. That is all I can think of that would affect mileage so drastically without affecting performance other that the engine is a little louder now. When it first started mileage went from 400 miles a tank to 300. Now it is at 230 miles a tank. Opinion?

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