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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 192 (Engine Control System Self-Diagnostics - 4 CYL (PZEV)) >> Diagnostic Tests >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank No. 1) >> Perform A/F Control

Perform A/F Control

WARNING: This page is about a different car, the 2003 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

To perform A/F control, see Fig 1.

Fig 1: DTC P0420 A/F Control Active Test
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