O2 sensors replaced..must u drive 150 miles or more to reset?
on 2004 Chrysler Pacifica

The last time I monitor an O2 sensor reset it took less than 50 miles. I drove it on the freeway. I think if the coolant temp is too low .IE a thermostat that is stuck open, then the O2 sensors will not go into close loop , thus will not reset. Good luck.