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Can you give me the model and engine size of this Jeep, and the p-code that you have?
Ok. Do you have the actual p-code related to the issue you stated above?
Ok. This p-code is pointing to a problem with the internal heater for this oxygen sensor. The PCM uses this internal heater to get the sensor to normal operating temps within a matter of seconds on cold starts. Replacing the oxygen sensor for bank 1 sensor 2 should solve your problem. This sensor is mounted to the exhaust pipe, on the driver's side, behind the catalytic converter.
no cold air blowing out when ac is on but low pressure