O2 Sensor Replacement

[Loyd Bonecutter]

I've heard low O2 cross counts between frames was the way to detect a lazy
sensor.  Have never seen the high and low reading deviate as much as
sugguested below, but I've never used a volt meter,  just the voltages
indicated on an OTC 2000.  Should I rethink this position ?  Maybe I need a
fresh O2 sensor !

Loyd Bonecutter 
Brookfield, IL
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> ------------------------------
> 
> From: Mazda Ebrahimi <kleenair at ix.netcom.com>
> Date: Mon, 03 Feb 1997 19:57:22 -0500
> Subject: Re: O2 sensor and white smoke
> 
> Tom Cloud wrote:
> > 
> > > Is the O2 sensor supposed to replaced as part of regular maintenance
and if
> > >  so, how often?
> > 
> > I read somewhere that the sensors begin to deteriorate (lower output)
> > at around 35k.
> > 
> > Tom Cloud <cloud at peaches.ph.utexas.edu>
> 
> Usually when the sensors start to deteriorate, you can tell by the shape 
> of the signal.  What used to look like a strong toggle (almost like a 
> switch), becomes slower, eventhough the sensor reaches the high voltage. 
>  This doesn't necessarily mean the sensor is a waste.  The 
> manufacturers generally leave a margine of error for sensor response 
> time in their transport delay calculations (transport delay is the 
> amount of time it takes the fuel to go from the tip of the injector to 
> the O2 sensor).
> 
> On a closed loop system, if you notice that the sensor is not reaching 
> .8 to .9 volts, you should probably replace the sensor.  The same is 
> true for the low end.  The toggle should go down to about .1 to .15 
> volts.
> 
> Best Regards, Mazda
> 
> ------------------------------