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Home >> Saturn >> 2003 >> LW200 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Test Description

Test Description

The number below refers to the step number on the diagnostic procedure.

  1. 6  - This step includes inspections for conditions that can cause the three-way catalytic converter to appear degraded. Before you proceed with this test, repair any conditions that you find.
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