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  1. P0131, which O2 Sensor part number?

    F150 Ecoboost Problems
    hey guys I got P0131 code which is Bank 1 O2 sensor went to dealership to buy the sensor he said you want the upper or lower sensor! I had no idea there are 2 sensors on each side anyone could confirm the part number needed for this code for our 2011 3.5 engines? :confused: