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How to approach repairs on O2 sensor codes?

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by (101 points)
i AM GETTING 14 CODES RELATED TO BANK 1 SENSOR 1 AND BANK 2 SENSOR 2 O2 SENSORS. I have other vehicles(subarus) that are throwing these types of codes.
My question is how to approach the sequence of diagnostic proceedure.
Reason I ask is I replaced o2 sensors on subaru and it is still throwing codes.
Vehicle: 2005 HYUNDAI SONATA

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