Code Enable Criteria

• Engine run time is greater than one minute.
• No CMP, CKP, ECT, EGR, EVAP purge solenoid, fuel trim, IAT, MAP, misfire or TP sensor DTCs are set.

DTC sets when HO2S2 voltage is inactive (voltage is not fluctuating outside 426-461 millivolt range) for greater than 2 minutes and 25 seconds.