O2 sensor

Last week I started investigating a Bosch 15733 4 wire universal fit oxygen sensor. They are used in a lot of cars, pickups, and even some heavy duty trucks. All Bosch 4-wire sensors have a black wire for the signal, a gray wire for ground and 2 white wires for the heater. A lean fuel mixture would lead the sensor to produce about .1 volt, where a rich mixture with little unburned oxygen would produce  about .9 volts

Hooked up the meter, and didn't get any results until I heated it up. The heater worked when I connected it to 5 volts, though I didn't get a positive result when I put C02 on it to replicate low oxygen, same result as with straight oxygen. Bad sensor. Or maybe I did something wrong, which is possible. I didn't get many pictures, as I don't have 5 arms, I should've setup a tripod and shot a video.

Getting ready to test

Here we can see what I believe is the ceramic heating element.

I learned 02 sensors, at least this type, don't work until they get up above 600 degrees, and maybe I should have used a torch to heat it instead of a heat gun, which may or may not have made a difference. I also learned I need to do more research BEFORE discounting a part as bad.

week 4 -30 hrs, 

total 100hr