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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 393 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0420: TWC System - Low Efficiency >> Conditions For Setting DTC

Conditions For Setting DTC

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

The catalytic converter efficiency is too low.

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