Hello all, I am trying to help a friend here. Hes lives in a county that has E-Check, and he has a check engine light on. When he takes it to have it diagnosed, it says it is one one of the O2 sensors. But they've both been replaced in the last 2 weeks. Any ideas on what's-up? Any info would help greatly... Thanx, Kevin

 

well the o2 sensor code also would apply to the circuit, check and see that one wire on each sensor has power and another has ground (im guessing you have a 3 wire) the other wire is signal and could be open but id look to the other 2 wires first