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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0420 Or P0430: TWC System - Low Efficiency (Bank 1 & 2) >> Test Description

Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 3 -  This step inspects for conditions that can cause the three-way catalytic converter efficiency to appear degraded.
  2. 5 -  A catalytic converter which has been discolored may be due to an engine running rich, lean or had a previous sever misfire. Verifying the fuel trim percentages may be of assistance in determining if such a condition exists.

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