Having trouble passing emissions?

EDWIN POISEL

MEMBER
2002 KIA SEDONA
6 CYL
2WD
AUTOMATIC
125,700 MILES

I have been trying to get my van through emissions for a year now, with no success.
It started with the check engine light, so I have the codes checked. The first code was PO431 and secondary was PO455; So, I had all three cats replaced and all 4 O2 sensors. Now I got code PO466, so I had the purge valve and the vent valve replaced. Checked all the hoses, the gas cap and the check engine light goes out for a little while and pops back on. The vehicle has been rejected at the DMV twice.
Can you please, please help?

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,192 POSTS

Hi,

Which code or codes return when the check engine light turns on? Also, interestingly, code P0466 isn't listed in my manual for this year/model Kia. Please confirm that is what is present.

Let me know.

Joe

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Thursday, October 6th, 2022 AT 8:10 PM

EDWIN POISEL

MEMBER
2 POSTS

The first code test came up with PO431, so I replaced the cats and the sensors. The second code was PO455, so I replaced the purge valve and those codes disappeared. The third code was PO446, I apologize for the fubar on the po466 earlier. This vehicle is beating to no end. Anyways PO446 showed up so I replaced the vent valve, but it's still on the last code after the drive cycle.

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Thursday, October 6th, 2022 AT 9:20 PM

JACOBANDNICKOLAS

MECHANIC
108,192 POSTS

Hi,

No problem. The P0446 makes sense now. LOL, this code doesn't necessarily indicate the control valve is bad. It indicates a fault in the circuit. It could be a wiring issue, a module issue, or even a partially plugged canister filter.

Do me a favor. I attached diagnostics below. Take a look through them and let me know if you are comfortable performing them.

Take care,

Joe

See pics below.

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