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Intake sensor? Might be refering to a Mass Airflow Sensor.. If you over-oil a K&N filter, they are known to get oil on the sensor which can mess with the readings. Out of the box, the filters are oiled fine. I havent had any issues with mine yet.
My experience is the same. Been using K&N for about 16 years. Oil it just enough to cover the the white spots on the filter. Dont put it in right after oiling either. Give it a day or so and let it soak in.