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HO2S Monitor Code

NOTE:
  • Do not turn ignition switch off.
  • When negative battery cable is disconnected, all readiness codes are cleared.

Ensure ambient temperature is 20-95°F (-7-35°C).

  1. Connect scan tool to DLC.
  2. Start engine and hold at 3000 RPM with no load (in park or neutral) until radiator fan comes on.
  3. Let engine idle for 5 seconds.
  4. Drive vehicle at steady speed between 50 and 62 MPH for about two minutes
  5. With transmission in "D5" position, decelerate from 62 MPH by completely releasing throttle for at least 5 seconds. If engine is stopped during this procedure, go to step  4 and repeat procedure.
  6. Check for readiness code with scan tool.
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