ok i just replaced my o2's about 6 months ago. all of the sudden my car is running bad as soon as it hits closed loop. i figured it wasnt the plugs/wires/fuel pump or filter because of the fact that the car runs fine in open loop. i even changed my tune back to make sure it wasnt that. im not throwing any codes. my o2 mV readings look like this. the driversside fluctuates between 50-850 at idle or low/normal driving. the right side is between 150-1000. my lterms on the driversside are a little above 128 (green/rich?) and the passengerside are a little below 128 (red/lean?). its hard for me to tell if this is any different from normal because of my cam i have had split blm's anyway. so am i right to think that i have a problem with one of my o2's? if there was an issue with one of the wires (whether it was open or shorted) wouldnt it throw an o2 code?