When the scan tool shows the O2 result as "Not Ready", does that ONLY mean it's not ready or could it also has failed? In another word, is there a "Failed" state in the result? I'm trying to determine if my O2 monitor is simply not ready or if something is actually wrong with the car. Without the check engine light on, the repair shops I contacted said they can't do anything. I have done the BMW drive cycles many times with no luck.