Interesting. I live in Charlotte and Tuesday morning it was down to 6 Deg F. Got in car and got low pressure warning for all four wheels. They look fine and car drove fine so I proceded cautiously to work. When I gor home that afternoon it had warmed up to 27 Deg F. I let tires cool and checked pressure. To my surprise they were spot on the correct tire pressure, not low a bit. I'm finding it hard to believe that a Delta T of 21 degrees would be enough to trigger the warning. I did the reset thing and all has been well since then
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