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HOMESERVICE MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 6 (ENGINE CONTROL SYSTEM - 4.2L - DTC P0420 TO P1682)DTC P0420REPAIR VERIFICATION
2006 Isuzu Ascender S, 5.3 M, 4WD

Repair Verification

2006 Isuzu Ascender S, 5.3 M, 4WDSECTION 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.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.