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If the tires weren't low on pressure then the light should not have come on. Not having a valve stem cap could cause this because as dumb as it sound the little caps act as tiny antenna's so that the computer can pick up on the data that the sensor is giving off.
Let me ask if by chance one of the tires that's missing the cap is on the rear? If so it might be that the computer is unable to read the sensor correctly..
There is one more thing that it could be which is related to tire temp, as you drive the air inside the tires expand a little (not much) but little, if you checked the tires right when you stopped then you could have been reading on the high side of the pressure, ever notice that it says "XX" amount of PSI COLD
You also said that it would come one for a little bit and then go back off and I'm curious if you where maybe driving at different elevations as this plays a little bit into tire pressure as well.
I work at NTB p/t and we have had a few newer Hyundais come in and the owners complain about the tire light being on and sometimes its a matter or 1-2 psi that we top it off with and the light goes off, I think these newer sensors and the programing is very sensitive. One thing I do really like is that the sensors on the new Hyundais have the rebuildable valve stems that use a little bolt the hold the valve stem to the sensor, this makes it so much easier to not break the sensors when changing tires.
I hope some of this info helps you and maybe solves ur issue.
Nope the cheap plastic caps do not act as an antenna..............
I replaced mine with a nicer metal cap and it didn't change anything. I had all 4 of the plastic caps off and no lights came on.
I believe you have a bad sensor on one of the wheels or one of the long life batteries is starting to fail
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