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Home >> Toyota >> 2003 >> Matrix Base, FWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Engine Control System Self Diagnostics - 4-Cylinder) >> Diagnostic Tests >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank No. 1) >> Circuit Description & Possible Causes
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Circuit Description & Possible Causes

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

For circuit description and possible causes, see Fig 1.

Fig 1: DTC P0420 Circuit Description
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