Engine Code P0431 - Kia Forum
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#1 (permalink) Old 04-10-2012, 11:17 AM
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Hello All. I have a 2004 Sedona with about 96k miles that has been a great car for us. I bought it new in 2004 and have done very little to it. I have to say that I am rough with this thing and am impressed on how it has held up. After finally changing my plugs, within a week or two I get the above code. I have seen a lot of answers for the fix and will try to change the O2 sensor first since I don't get a hot smell or burning from any of the cats. But which on the Sedona is the bank 2? Front of motor or back? A printout also suggested an intake leak. Wouldn't this affect the whole engine? I am probably due for O2 sensors so I am leaning this way. I would appreciate any info.

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#2 (permalink) Old 04-10-2012, 12:24 PM
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Yep #2 is the back bank.
My Bad... Thanks guys for correcting me..

Last edited by DavesSpectra; 05-09-2012 at 03:52 PM. Reason: I was wrong!
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#3 (permalink) Old 04-10-2012, 01:32 PM
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Thanks Dave. Now I will get the O2 sensor and try again.
Db
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#4 (permalink) Old 04-22-2012, 10:05 PM
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I am really confused now. I took a look at the Kia site and under the code listing it shows the front cylinders. I haven't compared the picture of the cat it shows, but the other picture highlights the front bank. I will try to hit up the dealer and see if they can confuse me anymore.

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#5 (permalink) Old 04-22-2012, 10:19 PM
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Bank 2 is the front bank, cylinders 2,4,6. The best thing to do, before you change the O2 sensor, would be to unbolt the exhaust from the precat and see if any pieces are missing. If they are, replace the cat ASAP or risk it breaking apart more and plugging up the main cat, which will then need replaced as well. This code almost ensures the cat is bad. If you aren't getting any O2 sensor codes I wouldn't be so hasty to change them. Fix your vacuum leak first, then move on to the next concern.
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#6 (permalink) Old 04-23-2012, 06:07 PM
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I appreciate the replies folks. I will check the cat before changing out the o2 sensor. I will also go ahead and recheck the intake to make sure I don't have a leak. I need to check and see if there is a change interval for the o2 sensors because I have never changed mine out. Time to get the car back into the garage and check things out. Thanks a lot guys. I will keep this updated when I get it figured out.

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#7 (permalink) Old 05-08-2012, 10:44 PM
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Over the weekend I put a new intake manifold gasket in and it seems to have solved my problem. My wife has driven the van on the highway a couple of times and we still have not gotten the code to pop up. So it looks like I may have just had a leak up there somewhere.

Thanks for all the input and I will report back if there is anything else.

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