What Should My O2 Sensor Voltage Be. In case it is not within range there is either an engine problem loose hose or the o2 sensor is bad. The o2 sensors voltage should fluctuate within the 100mV 900mV 010V to 090V range.
IF the downstream heated O2 sensor falls below 21 volts for more then 2 minutes a pending code P0137 will set. 3 Mar 14 2012. Once the converter lights off the downstream O2 sensor will settle down and flat-line at a steady voltage reading usually around 045.
We had a regular customer stop by the house with a check engine light on.
If your upstream O2 sensor continuously gives out a voltage that is consistently about 450 mV this may mean that your oxygen sensor is not responding to the fuel mixture. That being said according to the Nissan Shop Manual the correct voltage for the AIRFUEL RATIO SENSOR should be 15Volts at optimum. You will have NO CEL at this time. Once the converter lights off the downstream O2 sensor will settle down and flat-line at a steady voltage reading usually around 045.
