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Home >> Suzuki >> 2005 >> Aerio SX, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine General Information And Diagnosis >> DTC P0420: Catalyst System Efficiency below Threshold >> Circuit Description
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Circuit Description

ECM monitors oxygen concentration in the exhaust gas which has passed the three way catalytic converter by HO2S-2.

When the catalyst is functioning properly, the variation cycle of HO2S-2 output voltage (oxygen concentration) is slower than that of HO2S-1 output voltage because of the amount of oxygen in the exhaust gas which has been stored in warm up three way catalytic converter and three way catalytic converter.

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