Question about 2000 Kia Sportage
1996 spotage kia( p0422 whats this code mean ?)
P0422 Main Catalyst Efficlency Below Threshold (Bank 1) The catalyst’s efficiency is demonstrated by its ability to oxidize CO and hydrocarbon emissions. The Engine Control Module (ECM) compares the output signals of the front and rear oxygen sensors to determine whether the output of the rear sensor is beginning to match the output of the front oxygen sensor. Air/fuel mixture compensation keeps the frequency of the front oxygen sensor high due to the changes from rich-to-lean comvustio. The catalyst causes the rear oxygen sensor to have a lower frequency. As the catalyst wears, the rear oxygen sensor’s signal trace begins to match the front oxygen sensor’s signal trace. That is because the catalyst becomes saturated with oxygen and cannot use the oxygen to convert hydrocarbon and CO into H₂O and CO₂ with the same efficiency as when it was new. A completely worn catalyst shows a 100% match between the frequency of the front and rear sensors. The ECM sets P0422 if the average of caculated oscillation size of rear HO2S value is higher than threshold value during predetermined time.
Posted on Apr 30, 2010
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Posted on Jan 02, 2017
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