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Home >> Pontiac >> 2001 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Diagnostic Tests >> DTC P0420: Catalyst System Low Efficiency - Bank 1; P0430: Catalyst System Low Efficiency - Bank 2 >> Diagnostic Procedures

Diagnostic Procedures

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM TESTS. After performing powertrain diagnostic system check, go to next step.
  2. If any other DTCs are present, diagnose affected DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If other DTCs are not present, go to next step.
  3. Check that three-way catalytic converter is original equipment. See appropriate EMISSION APPLICATIONS article. Check for converter damage and rattle inside converter. Inspect for exhaust system leak, especially near HO2S. Ensure HO2S connectors are secured and not touching exhaust. If damage to converter is obvious, go to next step. Repair other exhaust leaks. After repairs, go to step  5.
  4. Replace suspect catalytic converter. After replacing converter, go to next step.
  5. Using scan tool, clear DTCs. Turn ignition off for at least 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  6. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no undiagnosed DTCs are displayed, system is okay.
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