O2 sensor 4wire

[John O Hornfeck]

Seth wrote:
> 
> On Mon, 1 Sep 1997, John O Hornfeck wrote:
> 
> > I saw that someone mentioned a Ford 4 wire O2 sensor.
> > Is there any sensors/brands that would offer me an alternative to the
> > Toyota 4 wire sensor I have to replace this week?
> > Thank you
> >
> > John O
> >
> >
> My recollection is that a 4 wire is power and ground for the heater ,
> groundfor the sensor, in case the exhaust system is "floating" and the
> signal for the sensor signal.  A well grounded 3 wire should work, or use
> the sensor ground to ground the exhaust.
> 
> Just an idea
> 
> Seth
Thanks for the reply

John O