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How to fix 2004 Kia Sedona with codes p0421 and p0431 I need help with these codes van will not pass inspection and thank you with any help in advance

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  • Cars & Trucks Master
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The code 421 is a problem with the catalytic converter or O2 sensors on bank one. Under normal conditions the front and rear sensors should be giving different readings back to the computer and they are more or less the same.
Code 431 is the same thing for bank two.
Unless you find a big exhaust leak, I doubt this is something you can fix yourself. You would need a scanner to watch the readings coming from the O2 sensors and the engine temp among other things to be able to determine the cause or causes.

Posted on Jan 05, 2013

  • Shawn white Jan 05, 2013

    I changed the O2 sensors on bank one do you think changing the O2 sensors on bank 2 may do it

  •  Stephen
    Stephen Jan 05, 2013

    I would be very surprised if changing any of the sensors makes any difference. If more than one sensor sets a trouble code, the problem is usually in the engine or wiring, not the sensors. Thats why you need a scanner to see what the computer is getting from the sensors, including the other engine sensors. It could be something like a faulty thermostat or exhaust leak.

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Posted on Jan 02, 2017

  • 21 Answers

SOURCE: P0421, P0431

Technically, you can put the car in neutral and press the gas while the car is running, til it reaches 3500 rpm. You don't have to actually have the car on the road while you do this.

Posted on May 30, 2009

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SOURCE: 2004 kia sedona #2 MISFIRE

Just had the same issue with mine....turned out to be the coil.

Posted on Aug 08, 2009

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SOURCE: DTC cods P0431 and P1159

my probleme i want to the maening for code1159 2003kia sedona

Posted on Dec 22, 2009

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SOURCE: pass side view mirror-2004 sedona

its pretty simple. take the inside inspection plate off, dont break tabs, unplug the electric connector, take out the 3 screws and mirror comes off. replace in reverse order. Its easier if you roll down window.

Posted on Jan 30, 2010

drsinister69
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SOURCE: how do i change the belts on a 2004 kia sedona van

There is a tensioner pulley for each belt, you loosen the nut on the front of the pulley, then there is a tensioner bolt that you loosen, that will move the pulley away from belt to remove the belt. You'll need to get to them from the passenger side under the car. You'll need to remove the plastic covers to get them.

Posted on May 02, 2010

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