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Whenever I Get in my car my sensors tell me that my right rear is low on pressure. I fill it up, and 2-3 days later it is low again. Low meaning 25 or so PSI, it hans't dropped below 22. I am running Firestone Firehawk runflats.
Could be a nail in the tire or a bad seal on the rim or a leaking valve stem or you made your sensor mad.
Pick one.
I had a similar slow leak. On mine it was the nut holding the valve stem to the wheel, it just needed about 1 turn to tighten it down and stop the leak. DO NOT OVER TIGHTEN, or you could break it.
Could be a nail in the tire or a bad seal on the rim or a leaking valve stem or you made your sensor mad. Pick one.
Those would be the top three candidates. I'm on my third set of Firestone Firehawks and have had zero problems with the tires themselves. Once I had a very slow leak on one tire...I replaced the o-ring on the stem and no more problem.
To suggest that the problem is because it's a Firestone tire is ludicrous.
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Have a good shop check the seal on the bead and also the valve stem area. It could also have a nail or screw in it that is letting air out at a slow pace.