General Motors Powertrain

224

UnclassifiedGeneral

What This Code Means

HO2S voltage fixed above 0.7 after 2 minutes of run time; System running rich; Intermittent problem

Possible Causes

  • •Drastic variation in fuel quality
  • •Faulty HO2S sensor
  • •Fuel system not operating to specification
  • •Harness short to 5V or 12V

Suggested Actions

  1. 1Check and adjust fuel system according to PSI guidelines
  2. 2Check harness for short to 5V or 12V
  3. 3Diagnose other present DTCs first
  4. 4Repair harness and retest
  5. 5Replace the HO2S sensor with a known good part and retest
  6. 6Warm engine to normal operating temperature by idling for a minimum of 2 minutes

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