O2S 1

Display shows voltage from 0.0 to 1.1 volts. This display indicates the voltage of the 02 sensor High signal circuit. With a COLD O2 sensor the signal circuit BIAS voltage of about 451 mV should be displayed. The oxygen sensor Will produce voltage in relation to exhaust oxygen content once the oxygen sensor reaches operating temperature. High exhaust oxygen content, or LEAN conditions, will produce low voltage (100 mV). Low exhaust oxygen content, or RICH conditions, will produce high voltage (900 mV). With the oxygen sensor at operating temperature and the engine in Closed Loop operation the oxygen sensor voltage should rapidly fluctuate between low and high voltage.