---------- 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