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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 2.0L (LTG) - Diagnostic Information And Procedures (P0335 - P26C8) And Symptoms) >> Diagnostic Information And Procedures >> DTC P0420: Catalyst System Low Efficiency >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Verify the conditions listed below do not exist with the catalytic converter:
    • Dents
    • Severe discoloration caused by excessive temperatures
    • Road damage
    • Internal rattles caused by damaged catalyst substrate
    • Restrictions
      • If a condition is found 

        Replace the catalytic converter.

      • Go to next step: If no condition is found 
  2. Verify the conditions listed below do not exist with the exhaust system:
    • Leaks
    • Restrictions
    • Physical damage
    • Loose or missing hardware
      • If a condition is found 

        Repair or replace the component as necessary.

      • Go to next step: If no condition is found 
  3. Verify the conditions listed below do not exist with the B52B Heated Oxygen Sensor 2:
    • Incorrect torque
    • Damage
      • If a condition is found 

        Replace the B52B Heated Oxygen Sensor 2 or repair the condition as necessary.

      • Go to next step: If no condition is found 
  4. Replace the catalytic converter.
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