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Message: <blockquote data-quote="goggomobil" data-source="post: 279526" data-attributes="member: 4070">Bro, it was a big headache as the modic did not detect it.  The O2 sensor works in a very narrow band around the optimum.  In normal operation the output of the sensor swings between about 0.2 to 0.9 V.  If you tap into the wiring (don't disconnect it) at the output of the sensor with a  high impedance voltmeter (digital voltmeter please don't use the analog one) you will see this swing in voltage every few seconds when the engine is running.If no voltage or if the voltage is stuck at high or low reading then the sensor is probably kaput.  Remember to let the engine run for a few minutes for the sensor to come up to temperature then the voltage swinging will begin.good luck.</blockquote>