TST Cap Sensor Leaks Air

[Mark Ulmer]

Getting ready for our final trip of the season to Door County WI. So, just got the camper out of storage today. Checked the air in the tires; added a couple of pounds as expected since temps have gone down around here since I last filled them. Then I put my TST cap sensors on the tires to make sure they were working. I found one sensor that leaks air no matter how hard I screw it on to the valve stem. It wasn't leaking a month ago when I used it last. It's not a problem with the valve stem, since I tried a different sensor on that tire and it worked fine. Has anyone experienced this? Any way to fix it, or do I just need to replace that sensor?

[Superduty]

There is a O Ring that seals the sensor to the valve stem. From what I remember, your only to snug them up. If you over tighten them, you can damage the O Ring.

When I got my TST, I got a bag of O rings. Makes me wonder, where did I put these?

[huntr70]

O ring is bad or has been pinched and grooved.

[Mark Ulmer]

Thanks, all. I'll check the O ring.