Emissions still the check engine light stays on?

KIMINIJONES

MEMBER
2002 KIA SEDONA
V6
192,812 MILES

Okay here's the deal, we were having trouble with the check engine light. We have replaced the catalytic converters, all the sensors, purge valves, the gas cap and had it checked for leaks and still the check engine light stays on. I beg you please help me. It's emission time again and I know it's a waste of time trying to go through the test. What do you think I need to do to get this mini van fixed once and for all?

Thursday, August 15th, 2024 AT 6:33 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

If the check engine light is on, have you had the computer scanned to see what codes are present? If not, that is where we need to start.

Here is a link that shows how to scan the entire system:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

If you don't have a scanner, often times, a parts store will do it for you free of charge.

Let me know if you can have it done. Also, let me know what codes are found.

Take care,

Joe

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Thursday, August 15th, 2024 AT 7:53 PM

KIMINIJONES

MEMBER
11 POSTS

The codes that come up are PO431, PO133 and PO446. The first code is the biggest pain.

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Friday, August 16th, 2024 AT 4:28 AM

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

I realize you have replaced a lot, Have you checked to make sure both the upstream and down stream sensors are functioning properly. You should see a variation in the voltages.

If they are moving between.01 and.09 v, it sounds like the converter is faulty. Also, are there any exhaust leaks?

Joe

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Friday, August 16th, 2024 AT 8:42 PM