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Home >> Oldsmobile >> 2003 >> Aurora >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0420: Catalyst System Low Efficiency >> Test Description

Test Description

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

  1. 2

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