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Unstable, because oxygen is a diatomic element meaning that O (charge of -2) cannot stand alone, when not in a compound it must be O2. So it has a charge of -4.
So, if the voltage output of the O2 sensor stays fixed (when testing it)... the O2 sensor has failed. If the pre-Cat O2 sensors are BAD, they will not be able to sense how Rich or Lean the exhaust gas is and consequently the PCM will not be able to fine tune the fuel injection to meet emission (pollution) standards.Not only that, your gas mileage will suffer (see: Symptoms of a BAD Oxygen Sensor).1  1. 2  2. 3  3.o, if the voltage output of the O2 sensor stays fixed (when testing it)... the O2 sensor has failed. If the pre-Cat O2 sensors are BAD, they will not be able to sense how Rich or Lean the exhaust gas is and consequently the PCM will not be able to fine tune the fuel injection to meet emission (pollution) standards.