o2 sensors..testing

[Bohdan.L.Bodnar at att.com]

Take a high impedance voltmeter and stick it across the sense lead and
the threads of the sensor.  Put the sensor underneath a propane torch.  You
should read 1 volt once the sensor heats up.  This DOES NOT test the sensor's
transient response characteristics -- the sensor may not be capable of
responding quickly to a/f mixture changes.

Incidently, if the sensor has a greenish tinge, throw it out -- it's been
contaminated by coolant being burned in the cylinders.

Regards,

Bohdan Bodnar