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Message: <blockquote data-quote="goggomobil" data-source="post: 301636" data-attributes="member: 4070">Sensor heating is to speed up getting the sensor to operating temperature on startup.  Not sure what the control strategy whether heating remains on or cuts off after reaching temp.  (but I think the heater is cut off).If your sensor is not working you will know for sure, engine won't idle or run properly.  If you are really curious you can wire up a digital voltmeter to the 12v supply to the sensor and see it it cuts out after a few minutes, and you can also look at the output signal, if the sensor is performing you will see the voltage swing between 0.2 and 0.8 V with frequency about 1 second.</blockquote>