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2004 Chrysler Pacifica Question: O2 sensors replaced..must u drive 150 miles or more to reset?
Answer #187GN September 13, 2014, 12:44Rookie
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.