flyrotary@lancaironline.net Mailing List Archive

That may well be the case. I am curious as to why that sensor is called out specifically as an air/fuel sensor as opposed to an O2 sensor, why the output is 0-5 V as opposed to the 0-1 V of a normal O2 sensor, why it has 4 wires instead of 5 or more for wide band sensors, and why it costs $200 or more depending on who is selling it. Of course, you doesn't always get what you pay for.

Some heating elements use current flow through or voltage drop across the heating element to determine temperature, don't they? That would explain the 4 vs 5 wire.

http://www.aa1car.com/library/o2sensor.htm