Yep the diesel does have one in the air filter box. Turns out I don't need a new one after all. The XJ was behaving rather badly - no power, lots of smoke, couldn't get it up a small slope.
The MAF (mass airflow sensor) was covered in crap and the computer couldn't work out how much airflow there was. So it didn't know how much fuel to stick in the cylinders.
Cleaned it up and all is back to normal.
Jeep wanted $1500 bucks for a new one. As if.
Cheers,
Ray
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