Cheap O2 Sensors and reference air

[David A. Cooley]

I don't think it travels down the wire... They use Hi temp, teflon
insulated wire that "breathes" no better than any other wire.  The outer
shell of the O2 sensor is vented to the atmosphere.  AC sensors have a
"floating" metal cap over the top of the sensor and the air is vented in
between the bottom of the cap and the hex of the threaded part.
The Bosch sensor I bought for my LeSabre has several holes around the top
where the wire enters covered with a small round ceramic "pill" I assume is
to keep water out..


At 01:20 AM 10/10/98 -0400, you wrote:
>
>> If the wires are properly crimped you will not loose the reference
atmospheric
>> air inside the wires.
>
>Ok, I'll bite. Could someone please explain to me how the reference air
>for an O2 sensor is inside the wire or comes from the wire? I had kind
>of figured there was an active layer (or layers), with thin conductive
>film electrodes on each side, which still allowed O2 to pass through,
>with the wires attached to the thin-film electrodes.
>
>Honestly I'm not trying to be difficult, or disagree with what anyone has
>said about how these sensors work, I'm just trying to *understand* it.
>
>   TIA,
>   Chris C.
> 
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