Make sure you test the O2 sensor immediately after driving. The non-heated sensors cool off quite quickly and may never get up to temp when idling. At least that has been my observation when testing my mixture. A cool O2 sensor will not give you accurate readings. 

Chris.

Wysłane z iPhone'a

Dnia Dec 22, 2011 o godz. 0:53 David Beierl <dbeierl@ATTGLOBAL.NET> napisał(a):

> At 12:15 AM 12/22/2011, John Lauterbach wrote:
>> Any suggestions on next steps?
> 
> Unplug it again, stick a digital voltmeter* on 2-volt scale on it and
> see how it behaves as engine warms up.  If you play with the throttle
> and can get it to show different voltages between about .2 and .8
> volts it's likely ok.  If so leave engine running and connect back to
> the ECU while voltmeter still connected.  The meter*should*
> immediately begin showing random changing readings, and if there's a
> bar graph it should be cycling up and down with a period of a few
> seconds at idle.
> 
> Report back results...
> 
> *Ideally a high-impedance analog meter like a VTVM, but not likely
> you have one.  But if the digital has a quick-acting bar-graph
> display that would be nice.
> 
> Yours,
> David
> ps - a contaminated sender can fail in a very short time - minutes or less.