O2 Sensor current?

[Orin Eman]

> This is the standard way of telling if the O2 is at temperature yet... many
> systems will bias the sensor to .45 volts through a very high resistance (10
> megaohms I believe).  Once the sensor is at temperature, it does provide
> enough current to move the voltage away from the preset level.

I seem to remember the bias resistors in my ecu were 768k.
The O2 sensor's impedance isn't _that_ high or you could never
get sensible results looking at it with a regular 1M impedance scope!

I beleive it's in the 10 to 100k range when hot.

Orin.