the o2 sensor must have a fresh air source outside the exhaust source for comparison
like mike stated
and the o2's receive that from the the o2 sensor wiring. again you should never solder or
crimp a o2 wire below the connector going to the o2 sensor
a 02 can even detect fresh air coming down the exhaust from higher up and send bad
signals( reports )to the pcm which in turn results in poor fuel management adaptives and
will result in a check engine lite to make a long story short
and i did not even mention 02 heater circuts hence the 4 wires and the sensors now


Mike Romain wrote:

> Some have the air charge coming in around the case to wires joint and
> some have it coming in along the insulation for one wire.
>
> This is the outside air charge needed to compare to the inside to make
> the signal if any.
>
> I asked 'mic canic' which wire because I for one don't really think he
> knows which O2 sensor goes where or which is which.
>
> One type has to be crimped to 'jury rig' it to fit and the other type
> can be properly soldered and heat shrinked to jury rig it.
>
> The best is still the one that fits properly......
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> "L.W.(ßill) Hughes III" wrote:
> >
> > That's hard for me to believe, the sensor's wires have to be
> > spliced for the cheapies: http://www.billhughes.com/95YJo2sensor.jpg
> > God Bless America, ßill O|||||||O
> >
> > mic canic wrote:
> > >
> > > please keep in mind the wiring on the sensor side of the connector carries a very
> > > small fraction of air to the sensor so it will work if you cut the wires and
> > > the sensor doesn't get the air and the check engine lite will come on
> > > a factory wiring schematic with the connector views is what you need