Q: which oxogen sensor am I needing to replace. Differ Symtoms on 2006 Kia Spectra

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Which oxogen Sensor will I need to replace. Check engine light is on. I have jerking in the ride at least once. Slow starts and dragging, like Im not moving at all but I am.
(1) Answer
Your question doesn't state why you need an O2 sensor.
The check engine light is on because the computer has detected a malfunction in the engine/emissions control system and has data and diagnostic codes stored that can be accessed using a scanner. I think you need a pro to help you.
If you want to find a specialist, here's a directory link for you: