Oxygen sensor question

["Mark Rutherford" <mark@afnetinc.com>]

Does anyone know what the output from the o2 sensor should be.  I know it
should generate a .5 volt signal at lambda, but the reading I am getting
from mine fluctuates from about .2 volts to 1 volt.  It just swings back and
forth erradacly.  Is this normal or should it be more of a steady reading?
Do you think that it is the engine causing the fluctuation a bad o2 sensor?

Thanks for any help

mark@afnetinc.com