So the last time I took the MINI out for a spin she decided to throw a low-tire warning at me - started out on the right rear and then showed all four as low. She's become a bit of a garage queen since I picked up a miata beater/DD, so I initially assumed it could be a low battery thing since it had been a month or two since the car was last driven and I didn't have the trickle charger hooked up during that time. I drove a bit to charge everything up and then reset TPMS, but the warning came right back. All the tires are at 35psi cold.

Curious if y'all think this is in-fact just a low battery issue, or something else. Seems odd to me that all four would fail at once if the sensors were bad (they are aftermarket) which suggests something central to me - but shouldn't that go away with a reset? I'm under warranty until next month, but the closest dealer is ~45 minutes away and I don't really want to haul all the way there and back again for something they won't cover.

 

Could be low battery or maybe the control unit is flaky or broken. Might check to see if the connection is secure or any rust/condensation present. Don't know how to test it. It would be odd for the individual tire units to all go at once.

Wheel electronics module, RDC 433MHZ which you can find on realoem.com

 

The sensors can go bad on the batties built in. But all four at ones sounds like the receiver unit for the TPMS system.

https://www.realoem.com/bmw/enUS/sho...diagId=36_1436

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did you check the tire pressure right b4 the drive? Where I am the temps have dropped pretty significantly in just the last week. I found all my tires, also checked regularly, 7 pounds low. CONSISTENT on an 4 on each of 2 cars! Physics ... lower the gas temp and pressure drops.