Top 10 Engine DTCs

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Top 10 DTC Codes

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9 of these top 10* codes can be diagnosed with a Smoke Wizard®

  • P0325: Knock Sensor 1 Circuit Bank 1 or Single Sensor
  • P0420: Catalyst System Efficiency Below Threshold Bank 1
  • P0300: Random/Multiple Cylinder Misfire Detected
  • P0171: System Too Lean Bank 1
  • P0401: Exhaust Gas Recirculation Flow Insufficient Detected
  • P0174: System Too Lean Bank 2
  • P0455: Evaporative Emission System Leak Detected (large leak)
  • P0442: Evaporative Emission System Leak Detected (small leak)
  • P0301: Cylinder 1 Misfire Detected
  • P1456: Manufacturer Specific

* Analysis of 2011-2012 Illonis Smog Check date

* Analysis of 2008 CA Smog Check data

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