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A/F sensor(up stream? bank 1? o2 sensor?) so many! help!

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What sensor do i get? So many upstreams. Which one do i choose? I dont wanna hafta spend $300 on a $900 vehicle for a sensor! I've replaced it with a generic, "upstream" o2 sensor and I'm still getting the same code. I've already replaced the catalytic converter with a stainless "high flow" and a new downstream sensor so now I just wanna get rid of that annoying check engine light. Help!
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