so ive been having this problem with my talon for a while. it seems my car is stuck in open loop. im also getting a cel for my o2 sensor but i just replaced it with a brand new oem unit. im going off of my xmas tree style a/f gauge which "sweeps" during closed loop operation. it just peggs out rich, all the time, even at idle. it will kind of try to sweep sometimes under moderate acceleration (maybe 25% throttle) but only sometimes. ive looked at everything! im at a complete loss. my injectors are fine, fpr works, mas if fine, ecm has been looked at. just wondering if anyone has had a simular problem. thanks guys.