Date:         Mon, 23 Mar 2020 05:26:39 -0400
Reply-To:     David Beierl <dbeierl@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@GMAIL.COM>
Subject:      Fwd: O2 Sensor problem
In-Reply-To:  <CAMOH8LK=gMksTiodFXYopPMw=WPnhefSOxOoeDQmWHMwPL9i=w@mail.gmail.com>
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---------- Forwarded message ---------
From: David Beierl <dbeierl@attglobal.net>
Date: Mon, Mar 23, 2020 at 5:26 AM
Subject: Re: O2 Sensor problem
To: Dennis Haynes <d23haynes57@hotmail.com>
Cc: vanagonlist a <vanagon@gerry.vanagon.com>


 Rarely will an O2 sensor go over 1 volt so what happens is that even after
> the O2 sensor is saturated and reaches its limit the ecu is still trying to
> go rich until it sees something.
>

High voltage signals rich and should drive the ECU lean.  However I think
the programmers must have anticipated the possibility of heater element
leaking to the sensor, because this condition in fact drives the ECU rich
just as does a sensor line shorted to ground does.

Yrs,
d