P0182 is CNG Temp Sensor Voltage Too Low - Compressed Natural Gas temperature sensor voltage below acceptable voltage.
If you have a CNG Jeep, there you have it. If not, I suggest you use a quality code reader, or scanner, that is preset for your Jeep (preliminary set-up of reader/scanner). I've seen the pukes at Advance Auto Parts and O'reilly just grab their code reader without setting it up and plug it into the vehicle sitting in the parking lot. Who knows what codes they are pulling up. There's been a few XJ owners post on the forums that they got a code that they can't find....this is probably why.
If we have data, letís look at data. If all we have are opinions, letís go with mine.