Solid, flashing, or on-again-off-again — the tire light has three messages, and one of them is about the sensors.
Three lights, three meanings
A solid TPMS light means a tire is meaningfully low — check all four, because the slow leak rarely picks the tire you would guess. A light that flashes for a minute at startup then stays on means a sensor has failed (their batteries last 7–10 years, then die one by one). A light that comes on cold mornings and clears by noon is just physics: pressure drops about 1 PSI per 10°F.
Quick tips
- The spare has a sensor on some models — the leak might be in the trunk
- Sensor batteries die as a generation; budget for the set
- TPMS is a backup, not a substitute — a gauge still beats it monthly
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