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2003 Ford Escape threw this code a few weeks ago so I put in a new 02 sensor and all is good, for about 3 weeks and several hundred miles. CEL back on again, so I replace sensor again, drive about 100 miles, highway, city, then take it in for inspection and it passes. Now, another 3 weeks and several more hundred miles, it's back again. What else could be causing this, and with the mileage intervals involved?
