Join Date: Jun 2012
Location: Tasmania, Australia
Drives: 2004 Carnival, 2.5L KV6 / GV6 / K5 engine
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OBD P0431 is an emissions system code that nominally indicates that the Bank 2 (the rear bank of cylinders) manifold catalytic converter is not doing its thing to spec anymore. Shouldn't be a driveability problem, its just an emissions issue.
Normally this will be that the manifold catalytic converter itself has failed & needs to be replaced, but could be that the oxygen sensor that monitors the rear bank MCC performance (i.e. the one on the exhaust pipe side of the MCC) has failed. Could be an exhaust leak but I think you'd have probably heard that before getting a P0431.
This is not info from experience with a Kia (P0431 being a generic code), but I'm pretty sure the same will apply to the Sedona 3.5l V6. (Doesn't apply to those of us with the 2.5l V6 which has a different arrangement).
A simple test of the O2 sensor would be to check its resistance & see if its to spec - I know its 6 ohms cold on the 2.5l, not sure what that is for the 3.5l engine though.
Last edited by PeterBlue; 10-11-2012 at 11:26 PM.