It is in the valve stem and if you have a leak and add fix a flat or any of the GOO stuff you should get it cleaned out ASAP it could gum it up.
ORIGINAL: 05flhtcse
I have been running my tire pressure at 30 on the fronts and 28 on the rears. Yesterday the temp here dropped to 24 degrees and I noticed the pressures all dropped about two pounds. I have been suspecting that the left rear is slowly losing pressure, as I have had to add a pound or two a couple of times. I can't find anything in the tire, so I am suspecting a poor tire to rim seal. Anyway, the left rear dropped to 25 lbs. and that set off the low pressure alarm. I aired the tire to 30 lbs. to reset the alarm. Now my question is, Is there anything I need to tell the people checking the seal to watch for so that they don't damage something in the TPMS ? Does there have to be greater care taken when changing tires ? I've never owned anything with this feature before.