Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSISUZU2006ASCENDER S, 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 236 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 4.2L - DTC P0135 TO DTC P0420)DTC P0420REPAIR VERIFICATION
2006 Isuzu Ascender S, 4.2 S, 4WD
Repair Verification
2006 Isuzu Ascender S, 4.2 S, 4WDSECTION Repair Verification
WARNING: This page is about a different car, the 2007 Isuzu Ascender, 2007 GMC Envoy, 2007 Chevrolet TrailBlazer, and 2007 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
- Clear the DTCs.
- Allow the engine coolant temperature to reach 70°C (156°F).
- Place the gear selector in Park, Neutral for manual.
- Set the parking brake.
- Press and hold the service brake.
- Run the engine for 6 minutes at 2,500 RPM.
- Allow engine speed to return to idle speed, then place gear selector into Drive or apply clutch pedal for manual.
- After 2 minutes verify that DTC P0420 has passed or failed this ignition cycle.
- If not passed or failed this ignition cycle, the test aborted resulting in an inconclusive test result. The above test may need to be repeated up to 5 more times during this drive cycle. The first test should be run after the initial warm-up period of 6 minutes. Between subsequent tests, maintain 2,500 RPM for 2 minutes.
- 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 procedure a second time.
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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.