Need to know if you have the 02 sensor still connected into the system while
you take the voltage reading.
The 02 should still be connected while you take the reading.
I think you will get the reading you describe if the 02 is not connected to
the circuit and ECU when you read the voltage.

----- Original Message -----
From: "Jim Felder" <jim.felder@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, September 26, 2008 9:37 AM
Subject: Question about testing O2 sensor with digital meter

> I'm having a recurring nightmare with my 2.1.
>
> Was dying after first 30 seconds, overly rich like it was the O2
> sensor. I replaced the O2 sensor with a good used one. It ran fine for
> a week, then started the same thing. So, I swapped out the ECU and
> temp 2 sensors. No help.
>
> When I test this second O2 sensor, I hook up my digital meter (set to
> 2v) and it starts out at zero as the car warms and eventually tops out
> and hovers (at idle) just over .800.
>
> Is this right?
>
> Jim