Changed from 18" to 20" - tpms malfunction
They may not be the correct TPMS for your car. I am no guru on TPMS but I think it needs to be the proper match for the vehicle. Some one else will need to chime in here.
Or, the batteries could be bad, I had a set of wheels last year where three of the TPMS stopped working at different times because of a bad batch of batteries.
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