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2009 Subaru Legacy Limited - TPMS Light
The TPMS light is pretty persistent on my dashboard over the last few weeks. I've been measuring the air on a cold tire before it's driven per the door jamb on the car:
Fronts 33 psi, Rears 32 psi.
All of the tires are within 1-2 lbs of the recommended limit, with the exception of the right rear tire (passenger side rear tire), which came it at a surprising 25 psi.
Several times, I have added air to the tire to bring it to the 32 psi, and it will last for 1-2 days, and the light will return.
I've inspected the tire with a flashlight, run my hands over the treads, and I can't find any debris or other issues that could indicate a leak (like hitting a nail, etc.) So, this post is more of a "what exactly does my TPMS sensor do on my car" question.
Does the TPMS have the ability to "release" the valve to let out excess air pressure? My thought is that if the sensor is faulty, and it thinks that there's too much air, if it's releasing some to get it in check. I've had a relative that had this issue on their `08 Nissan Sentra and it turned out that the sensor was faulty.
I'm not sure if the Subaru ones are as complex or complicated, and either way I will be bringing it up to the dealer when I bring it in for my 18,750 mi service in a week or two.
Any thoughts? Thanks.