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Home >> Toyota >> 2003 >> Sienna CE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self Diagnostics >> Diagnostic Tests >> DTC P0420: Catalyst System Efficiency Below Threshold >> Confirmation Engine Racing Pattern
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Confirmation Engine Racing Pattern

For confirmation engine racing pattern, see Fig 1.

Fig 1: DTC P0420 Waveform Patterns & Confirmation Engine Racing Pattern
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