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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Engine Controls And Fuel - 1.4L (LUJ LUV) - DTC P0300 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0420: Catalyst System Low Efficiency >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the conditions listed below do not exist with the catalytic converter(s):
    • 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.

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

        Repair or replace the component as necessary.

      • 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.

    • If no condition is found 
  4. Replace the exhaust front pipe and the warm up three-way catalytic converter.
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