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Q:

looses power on hills on 2003 Kia Sedona

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Check engine light has been on a while. Now I am loosing power.Checked codes and it comes up po305, po325, and po431. Do i need to replace the main catalytic converter or is it just a sensor.
(1) Answer
Sounds like if the light has been on for a while that irreversible damage may have already occurred to the bank 2 catalytic converter (if not bank 1 also).

However, fix the symptom before putting the new converter on! If not, you will quickly damage the new one too. Sounds like a cylinder misfire on the #5 cylinder - this should be tested to determine if you have a plug or coil problem, or a different problem. Good luck.