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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 >> Test Description

Test Description

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 number below refers to the step numbers in the diagnostic procedures.

  1. 3

    This step tests for conditions that can cause the catalytic converter efficiency to appear low. Inspect and repair conditions, if any, before proceeding.

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