low tire pressure is on, how you stop it
I would first add some air to the tires if they are low. If that doesn't work, I'd inspect all 4 wheel sensors to see if they are faulty. If they check out , then there is a fault within the system itself.
Might be a nail or screw that you ran over and may be in the tire tread. I had a very sloooow leak in a rear tire last week and the low tire warning light came on. Couldn't see the screw with the sheared off head that was imbedded in the tread! A patch on the tire got it fixed, thank goodness! I'd say have it checked out at a local tire repair shop.
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