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Home >> Suzuki >> 2001 >> XL-7 Base, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0420: Left Bank Catalyst System Low Efficiency >> Condition

DTC P0420: Left Bank Catalyst System Low Efficiency: Condition

DTC is set when value from HO2S bank No. 1 (left bank) sensor No. 2 (B1 S2) becomes closer to value from HO2S bank No. 1 (left bank) sensor No. 1 (B1 S1). MIL is illuminated when Power Control Module (PCM) detects malfunction during 2 consecutive drive cycles. Possible causes are:

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