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My TPMS light has never been on, but my (!) light was on for a few months last winter. When I went in for an oil change this spring the dealer hooked it up to diagnostics and it said my tires had 99psi! It was obviously an error so they reset it and I had no warning lights all summer until just yesterday when the temp dropped. But I know for a fact that I can still turn off my VSA while the (!) light is on. And the manual specifically states that VSA is always on if the TPMS light is on.
Anyhow, back to NITROGEN. Anyone using it? From what I've read it is less affected by temperature changes. Meaning your tire pressure should stay pretty constant year round.
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