finally got mine hooked up but it's not acting as you've described. I understood that under "normal" driving it will move from lean to rich, back and forth as the computer makes adjustments. Only when you get on it will it give you a true reading.

Mine is showing "normal....yellow", towards the rich side all the time, no movement, just staying lit. Think my 02 sensor is toast or what? TIA

Did you hook it up to one of the whire ones or the black one? Switch it around and see what happens.

I'll have to check it out again but you can confirm that it's supposed to be moving between lean and rich right? Thanks Joe.