Well guys I need your help again. I have fast bank to bank system on my mustang. I recently changed motors and the sensor has been sitting for about 4 months. I sent my cpu off to FAST to get updated and all that good stuff while the car was down. Well I went to fire up the car today and my actual A/F shows to be 0.00. Its like the sensor isnt even turned on. So I checked to make sure it was getting power. The harness is getting power where is should be, so either the sensor is bad or maybe FAST messed up when they updated it and didnt calibrate it for a wideband o2. Is there anyway to check these two scenerios or does anyone think it could be something else? Thanks!