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I just got a tire pressure dash indicator warning today and have seen this mainly on cold nights but will go away after some miles of driving.
HOWEVER, this time it's nothing like that. There are dashes (-) for all 4 tire readings so pretty much it's blank.
If it matters, I removed my spare about a week ago but that dash warning came on a week after. If it was just the spare TPMS malfunction I would at least still see the readings on all other 4 tires.