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Code Enable Criteria

Engine run time is greater than one minute.
ECT is greater than 140°F (60°C).
TP angle is greater than 7 percent.
No CMP, CKP, ECT, EGR, EVAP purge solenoid, fuel trim, IAT, MAP, misfire, system voltage, or TP sensor DTCs are set.

DTC sets when O2S1 voltage is not fluctuating outside 300-600 millivolts for greater than 49 seconds.