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Home >> Cadillac >> 2002 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 182 (Engine Control System - Self-Diagnostics) >> Diagnostic Tests >> DTC P0420: Catalyst System Low Efficiency >> Conditions For Setting DTC
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Conditions For Setting DTC

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

HO2S 2 signal is as active as HO2S 1 signal.

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