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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0420 & 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. 4

    Before replacing the three-way catalytic converter, correct any conditions which may have damaged the catalyst.