Just an update, I finally got around to replacing the faulty TPMS, bought a set of 4 sensors for about $50 of E-Bay and it works well, so much for the price from the Jeep dealership, I could have bought 13 of them compared to what the dealership wanted for just one plus fitting was extra. Just drove for about 10 minutes and it registered on the dash with the correct tyre pressure.
I had a close look at the screen for the tyre pressure monitoring and there are 5 dots underneath the listed tyre pressures so maybe there a pickup sensor for the TPMS in the spare as well, one of the dots has a light in it and as the spare doesn't have a TPMS in it, must fit a sensor in the spare wheel one day and see if it does register. Sort of makes sense though.
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