WARNING LIGHT · TIRES / TPMS
The tire pressure monitoring system sees at least one tire significantly under (or over) the correct pressure — or a fault in the TPMS system itself.
A steady light usually just means a tire is low — check and inflate to the door-jamb spec soon, since a low tire wears fast and handles poorly. A light that flashes for a minute then stays on points to a TPMS sensor fault rather than pressure, and should be diagnosed.
The tire pressure light — a horseshoe shape with an exclamation mark — is your car’s TPMS (Tire Pressure Monitoring System) telling you a tire is off, or that the system itself has a fault. The first clue is how the TPMS light behaves:
- Steady → a tire is genuinely low. Check your tire pressure and inflate to the spec on the placard — the sticker in the driver’s door jamb (your owner’s manual lists it too).
- Flashing for a minute, then steady → a TPMS sensor fault, usually a dead sensor battery, not a low tire.
In Florida, temperature alone trips it constantly: air pressure drops about 1 PSI per 10°F, so a cool morning can light it and a hot afternoon can clear it. But if it stays on, don’t wave it off — a low tire wears fast, handles poorly, and can fail at speed.
The common causes are low pressure, a slow leak, an aged-out sensor battery (they last 5–7 years), or a system that needs a relearn after new tires or a tire rotation — something most European cars need a scan tool to do, which is why the light sometimes lingers after a tire shop visit. We find which it is and put it right, price in writing first.
WHAT YOU'D NOTICE
- Amber tire-pressure symbol (a horseshoe with an exclamation mark)
- Steady light = low pressure; flashing-then-steady = system/sensor fault
- Sometimes a visibly low or soft tire
- The TPMS warning light may appear on cold mornings and clear as the day warms
WHAT TRIGGERS IT
Common causes
Low tire pressure (temperature swings)
The most common reason. Air pressure in a tire drops about 1 PSI for every 10°F, so Florida's cool mornings and hot afternoons can trip and clear the light on their own. If it stays on, check your tire pressure — one of them is genuinely low and needs inflating to the correct spec.
Related service: Tires & Alignment →A slow leak or puncture
If one tire keeps going low after you fill it, there's a leak — a nail, a bad valve stem, or a corroded rim. It's worth finding early: a slow leak becomes a roadside flat tire, and a plugged nail is far cheaper than a ruined tire.
Related service: Tires & Alignment →Dead TPMS sensor battery
The tire pressure sensor inside each wheel runs on a sealed battery that lasts roughly 5–7 years. When one dies, the light comes on (often flashing first) even though the tires are fine. The sensor is replaced and the system relearned.
Related service: Tires & Alignment →Sensor damaged or needs relearn after service
A sensor can be damaged during a tire change, or the system may just need a relearn procedure after new tires or a tire rotation. On many European cars this relearn requires a scan tool, which is why the light sometimes stays on after a shop visit elsewhere.
Related service: Tires & Alignment →ON YOUR MARQUE
What it usually means by make
BMW, Mercedes, Audi and VW mostly use direct TPMS — a battery-powered sensor in each wheel — rather than indirect systems that infer pressure from the ABS wheel speeds. That means two things in Florida: the sensor batteries age out around 5–7 years and set the light, and after any tire service the system usually needs a proper relearn with a scan tool. If your light stayed on after new tires elsewhere, an incomplete relearn is a common reason.
Tire Pressure Light (TPMS) on in your European car?
We read the live data, confirm the real cause — not just the light — and put the price in writing before any work. Backed by a 2-year warranty on major repairs.
COMMON QUESTIONS
Tire Pressure Light (TPMS) — FAQs
Why is my tire pressure light on when the tires look fine?
Two common reasons. First, temperature: air pressure drops about 1 PSI per 10°F, so a cool Florida morning can trip the light even though nothing's wrong — it often clears as the day warms. Second, a sensor fault: the TPMS sensors have batteries that die after 5–7 years, and a dead one lights the warning while the tires are perfectly inflated. A quick check tells pressure from sensor.
Is it safe to drive with the tire pressure light on?
If it's a small pressure drop, you can drive to a gas station to top up — but don't ignore a steady light. A significantly underinflated tire overheats, wears out fast, hurts your fuel economy and handling, and can fail at speed. Check your tire pressure against the placard in the driver's door jamb and inflate to spec. If one tire keeps going low, it has a leak that needs finding.
What's the difference between a flashing and a steady tire pressure light?
It's an important distinction. A steady light means the system is reading low pressure — check and inflate your tires. A light that flashes for about a minute at startup and then stays on means the TPMS itself has a fault — usually a dead sensor battery — rather than a low tire. Steady = check air; flashing-then-steady = get the system diagnosed.
How much does a TPMS sensor replacement cost?
On most European cars, plan on roughly $80–$150 per wheel for the sensor, installation, and programming — and if the light was plain low pressure, the fix costs nothing more than air. Sensors are replaced as their batteries die; when one goes of old age, its siblings are the same age, which is worth knowing when you're deciding whether to do one or all four. Either way, you get the price in writing before any work.
How do I reset the tire pressure light?
First fix the cause — inflate the low tire to the door-jamb spec, or repair the leak. On many cars the light then clears itself after a short drive. Some need a reset through the dash menu, and most European cars need a proper relearn with a scan tool, especially after new tires or a sensor replacement. If it won't clear after you've corrected the pressure, that relearn (or a failed sensor) is usually why.