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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 114 (Engine Control System Self-Diagnostics - 4-CYL (Except PZEV)) >> Diagnostic Tests >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank No. 1) >> Circuit Description & Possible Causes

Circuit Description & Possible Causes

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For circuit description and possible causes, see Fig 1.

Fig 1: DTC P0420 Circuit Description & Possible Causes
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