Its related to the oxygen sensor and/or oxygen sensor heater. There are 4 sensors the Jeep is equipped with.
In most cases one of the recommended solution for all those faults is a sensor replacement, however before doing that and spending a lot of money. Go to auto zone and have them tell you what O2 sensor is bad buy it and replace it. Go back to them to have the code cleared. O2 sensors run 20-50bucks. Good Luck
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