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Home >> Suzuki >> 2003 >> Vitara 4D Utility, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0420: Catalyst System - Low Efficiency >> Condition
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DTC P0420: Catalyst System - Low Efficiency: Condition

DTC is set when Engine Control Module (ECM) detects that value from HO2S-2 becomes closer to value from HO2S-1. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:

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