O2 Volts

[David A. Cooley]

> Ahh... Now I see.  Technically speaking, the O2 sensor should be
> called an O2 differential sensor.  Or maybe a "lack of O2" sensor. ;
> )  No, the sensor doesn't make a voltage when there is oxygen on the
> sniffer side of the sensor.  It makes a voltage when there is no
> oxygen on the sniffer side.  Now the Argon thing, I'd like to know
> more about.  IIRC, the ecm supplies a bias voltage to the sensor to
> prevent false readings like the ones you got in plain air.

Actually, It provides a bias voltage so it knows when the sensor either is
shorted or open.
If it see's 450mv for a preset time and the engine is running etc, it sets a
defective O2 sensor code... if it see's 0v for a long enough time, it set's
a defective O2 code and a lean exhaust code.