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With the temperature drop a few days ago, my 2021 rear driver side tire went to 27psi and the warning came on. I filled it to 31psi, even with the other 3 tires. I've now been driving around for 2 days, and the warning will not shut off. Why is that?


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Yeah, around 31 is probably the threshold for the first warning. Tires should be at 35 cold, so air them up, and that should take care of the problem. Do that, and report back.
 

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Had this same thing the last two days. Indicator would not reset. Hyundai dealer service person over the phone told me to fill all four tires to 35psi while leaving the car running (don’t know what that had to do with it, but why not)… indicator reset immediately, all good.

The plate on my door sill does in fact call for 35psi. She told me the 33 I had used was not sufficient.
 
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