in order to work sensors will need to be from a 2013 (might be 2014 I can not remember for sure) or newer jeep and it does take some time for them to read on a 2015. You need to drive around for 20 minutes or so if they have been sitting a long time. I swap a set of tires on rims back and forth depending on if I am offroading or just running around (one set of fat 35's and one set of skinny 33's) it always takes a bit of driving around before they register.
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