john pearson wrote:
>
> I would like to add an O2 sensor to my car. Is there an inexpensive
> and
> common device available, and what would I ask for (part #,
> application).
> Also, any details on how they work - do they change resistance or
> generate a
> current? Any web pages that deal with this subject. Any details,
> schematics,
> charts, etc.. would be great.
> Thank you
> John
Cheap o2 sensors availiable from JC Whitney, Chicago 312-431-6102.
The older 2-wire are heated by the exhaust manifold and output a DC
voltage that equals 0.6vdc when gases are optimal (14:1).

The 3-wire use internal heating element (12vdc), used in turbo-charged
and also in many newer cars, don't have to be mounted on the manifold.
Output also 0.6v. Range from 0v (air) to 0.9v (rich).