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Code Enable Criteria

Engine speed is 1500-3000 RPM.
Loop status is closed.
Calculated airflow is greater than 7 grams per second.
No CAM, CKP, ECT, EGR, EVAP purge solenoid, fuel trim, IAT, MAP, misfire, O2S1, system voltage or TP sensor DTCs are set.

DTC sets when sensor signal has not switched greater than 10 times within a 100 second test.