A tire pressure warning light that won't clear after you've aired up all four tires usually means a TPMS sensor has failed or needs to be relearned to the vehicle, not that the tires themselves are low. Indianapolis Tire Shop diagnoses and services TPMS sensors as part of routine tire work rather than as a separate add-on visit.
The light comes on for one of two reasons: an actual pressure problem, or a sensor that's stopped talking to the vehicle. Airing up all four tires and watching whether the light clears is the fastest way to tell which one it is — if it stays on after that, the sensor is the issue, not the air.
TPMS sensors run on a small battery inside the wheel that isn't replaceable on its own; when it dies, the whole sensor gets replaced. They also need to be relearned to the vehicle any time a tire is removed and reseated, or the system can keep reporting a stale reading even with a good sensor installed. Indianapolis Tire Shop handles both — sensor replacement and the relearn procedure — as part of a tire swap or on its own.
Why won't my TPMS light turn off even though the tires are fine?
If the tires are actually at the right pressure and the light is still on, the sensor either failed or lost its connection to the vehicle's system after tire work was done somewhere else. A relearn re-establishes that connection; if the sensor's dead, it needs replacing before a relearn will hold.
Does a sensor need to be replaced every time tires are changed?
No — most sensors survive a tire change fine as long as whoever pulls the tire off the rim is careful around the sensor stem. What does need to happen every time is the relearn, so the vehicle's computer reads the sensor that's actually in each position instead of a cached value from before the swap. Three things account for nearly every TPMS complaint that comes through the door:
- A dead sensor battery — the only case where the part itself needs replacing
- A sensor damaged when a tire was pulled off the rim, which is a mounting issue rather than a sensor defect
- A relearn that was skipped after tire work and just needs to be run
Can I just ignore the TPMS light if the tires look fine?
You can, but you lose the early warning it's designed to give — a slow leak from a nail or a bad valve stem won't show up until it's serious. It's worth diagnosing rather than living with the light on.
How do I know if it's a sensor problem versus low air?
Air up all four tires to the correct pressure first. If the light clears, it was air; if it stays on, the sensor or the relearn is the issue, and that's a diagnostic visit, not another trip to the air pump.
Does a TPMS sensor need to be replaced every time I get new tires?
Not automatically — the sensor itself usually survives a tire change. It's the relearn procedure that has to happen every time, so the vehicle recognizes the correct sensor in each wheel position.