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Home >> Chevrolet >> 2000 >> Venture Value >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0420: Catalyst System - Low Efficiency >> Circuit Description
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Circuit Description

Three-Way Catalyst (TWC) system is used to control emission. PCM uses signal from Heated Oxygen Sensors (HO2S) to read efficiency of TWC. DTC will set if TWC oxygen storage capacity is less than a predetermined threshold.

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