LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 250 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0420: TWC System - Low Efficiency >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The number below refer to the step number on the diagnostic procedure.

  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. 3  - This step includes checks for conditions that can cause the TWC converter to appear degraded. Before you proceed with this test, repair any conditions that you find.
  3. 5  - If you need to replace the TWC converter, be sure that another condition which could cause damage to the converter is not present. Correct any possible causes of converter damage before replacing the catalytic converter in order to avoid damage to the replacement converter.

scientia non olet · About LEMON Manuals