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Home >> Suzuki >> 2005 >> XL-7 EX, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> H27 Engine >> Diagnostic Information and Procedures >> DTC P0420: Catalyst System Efficiency below Threshold (Bank 1) >> DTC Detecting Condition and Trouble Area
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DTC Detecting Condition and Trouble Area

DTC TROUBLESHOOTING CHART

DTC detecting condition Trouble area
While running under conditions described for "DTC Confirmation Procedure", output waveform of HO2S-1 becomes similar to that of HO2S-2. (2 driving cycle detection logic)
  • Exhaust gas leakage
  • Warm up three way catalytic converter
  • Heated oxygen sensor-2 or its circuit
  • ECM
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