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Tire pressure seems acting strange

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Good morning all
My back tire passenger side was showing 34 psi and was getting warning , added air and it dropped in one day , did tire rotation in Costco and they checked the same tire I had problem with and there was no signs of damage , day later same position ( passanger’s side back tire ) shows warning , which doesn’t make sense since they rotate the tire and if there is a problem with tire now it should be showing front one !! Is there a sensor or something computer related that is not working correct ? Appreciate if you guys can help , from looking at the tires also all look same and no sign of deflation!
 
How long / much did you drive after the rotation? Sometimes it takes a little (had cars that took about 25km, some much more or less) for the TPMS to correctly calibrate after a rotation or seasonal change.

And did you check (or the guys at costco) the pressure with an actual gauge to see if it matches the readings?
 
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