Alright, so when I tested the o2 sensor when it was off the vehicle I touched my ohm meter to the 2 black terminals/wires.
Now to test the actual sensor, I connect my meter to the blue and white wires, correct? What should the milivolt reading be once it remains somewhat constant?
I just tested it... I clipped the + (red) to the white wire. and the - (black) to the blue wire.
After I had them connected, I watched the meter BEFORE starting the truck. it started at about -1mv and went up to 30mv and kept going... Once I started the truck, it was at about +70 MV then went down to about 65mv, then jumped back and fourth between 63mv and 65mv for a little bit, then slowly kept dropping...
What does this all mean? Am I doing this right??? Agghhhh! I'm so confused!