LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saturn >> 2006 >> Relay 3.9 1, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 3.9L - DTC P0010 To DTC P0420 >> DTC P0420 >> Repair Verification
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Repair Verification

  1. Clear all DTCs.
    2. IMPORTANT: DO NOT touch the accelerator while a catalyst test is in progress.
  2. Operate the vehicle within the Conditions for Running the DTC.
  3. Verify if DTC P0420 has passed or failed this ignition cycle with the scan tool.
  4. If 6 tests have been attempted and the DTC has not run or passed during this key cycle, turn the ignition to OFF for 30 seconds, then run the test a second time.
  5. A maximum of 6 tests per key cycle will run if each test is a combination of passed, failed, or aborted tests.
  6. After a code clear, this diagnostic may conclude in as few as one test attempt. However, this diagnostic may require as many as 18 test attempts which would require at least 3 drive cycles.
scientia non olet · About LEMON Manuals