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2012 335is
Last week I had my brakes checked at the dealership.
They found no issues and I had approx. 9mm of pad depth.
Today, like every Fri., I checked my tire pressures. All we fine except the passenger side rear; only 23psi. These are 30 ratio so ideal is 46psi.
Removed the tire - no cuts or nails.
I am thinking a valve stem leak but I wonder if something could have gone wrong at the dealership.
Of note, the computer shows all 4 tires as green. I am surprised that a psi of 23 did not trigger a warning. By the way, I used 2 different guages to verify the pressure.
Could the TPMS be giving me a false sense of security?
Again, these are a 30 ratio so they have very little air in them.
Thank you for your input.
Jim
 

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Possibly the TPMS was reset when that one tire was low and it then considered them all normal. To test the system and sensors I would set the tire pressures, then reset the TPMS. Then, I'd drop the pressure in one tire and see if the system warns you. You can refill that tire and try each of the others in the same way.
 
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