Question about 2003 Kia Sorento
REPLACE THE CATALYST BOTH O2 SENSORS ON BANK 1 STILL HAVE THIS COD PO421 PO431
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Posted on Jan 02, 2017
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P0421....Warm Up Catalyst Efficiency Below Threshold (Bank 1)
sounds like you need to test the O2 sensor which their could be two of them one before the cat and one after ,check the two wires the same colour for a 12v feed and then with the plug out do a continuety test on the sensor .
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