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Conditions For Clearing MIL/DTC

The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic runs and passes.
The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.
The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
A scan tool can clear the MIL/DTC.