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Home >> Chevrolet >> 2001 >> Cavalier LS, 2.2 4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Engine Controls Self-Diagnostics - 2.4L) >> Diagnostic Tests >> DTC P0420: TWC System Low Efficiency (Bank 1) >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2

    If any component DTCs are set, diagnose those DTCs first. A malfunction in a component can cause the converter to appear degraded or may have caused the malfunction.

  2. 4

    This step inspects for conditions that can cause the 3-way catalytic converter to appear degraded.

  3. 5

    If you need to replace the 3-way catalytic converter, make sure that another condition is not present which could damage the converter. Correct any possible causes of converter damage before replacing the catalytic converter.
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