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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls - 2.0L - DTC P0351 To DTC P2138) >> Diagnostic Information & Procedures >> DTC P0420 >> Repair Verification

Repair Verification

WARNING: This page is about a different variant/trim than selected.
  1. Operate the vehicle within the Conditions for Running the DTC.
  2. Verify if DTC P0420 has passed or failed this ignition cycle with the scan tool.
  3. If 6 tests have been attempted and the DTC has not run or passed during this key cycle, turn the key to OFF for 30 seconds, then run the test a second time.
  4. A maximum of 12 tests per key cycle will run if each test is a combination of passed, failed, or aborted tests.
    5. IMPORTANT: DO NOT touch the accelerator, the HVAC, or the steering wheel while a catalyst test is in progress.
  5. After a code clear, the catalyst test will run once if the test is a pass.
  6. Allow the engine to return to a stabilized idle. Keep the vehicle in DRIVE.
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