2004 Kia Sorento PO431 codes

ICEMAN4529

MEMBER
2004 KIA SORENTO
6 CYL
4WD
AUTOMATIC
117,000 MILES

I drive a 2004 kia serento, the check enegine light came on. And I check the code it was a po431 code. What does that mean(po431)

Sunday, February 15th, 2009 AT 2:26 AM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

P0431 Warm Up Catalyst Efficiency Below Threshold

Tests/Procedures:

1. Monitor the front and rear oxygen sensors while driving the vehicle at approximately 55 miles an hour. The oxygen sensors should cross-count consistently 8-10 times per 10 seconds.

2. Monitor the fuel trims for being normal at idle and at 55 MPH steady cruise.

3. Check the inlet to outlet temperature on the catalytic converter. Generally the rear should be 50 degrees, or more, hotter.

Potential Causes: Faulty oxygen sensor
Catalytic converter