That Little Horseshoe Light
The tire pressure warning light, shaped like a horseshoe with an exclamation point, is one of the most misunderstood warnings on your dashboard. Sometimes it means a tire is low and you just need air. Other times it means a TPMS sensor has failed and needs replacement. Knowing the difference saves you worry and money. Here is how the system works and what to do when the light comes on.
What TPMS Actually Does
TPMS stands for Tire Pressure Monitoring System. Most modern vehicles use a small battery-powered sensor inside each wheel that measures air pressure and reports it to the car. When pressure drops too low, the light comes on. The system is a genuine safety feature, since underinflated tires handle poorly, wear out faster, and can fail at freeway speed, especially in Sacramento’s summer heat.
Why Sensors Fail
TPMS sensors run on a sealed internal battery that typically lasts five to ten years. Once that battery dies, the sensor cannot be recharged and must be replaced. Sensors can also be damaged during careless tire mounting or by corrosion. If your vehicle is getting older and the light stays on even with properly inflated tires, a dead sensor is the likely cause.
Symptoms of a Failing Sensor
- The pressure light stays on even after you correctly inflate all tires
- The light flashes for a period when you start the car, then stays solid
- One tire consistently shows no reading on vehicles that display individual pressures
Pro Tip: A solid light usually means low pressure. A light that flashes at startup and then stays on usually means a system or sensor fault, not just low air. Either way, do not ignore it.
What Replacement Costs
TPMS sensor replacement cost depends on your vehicle and how many sensors need replacing, including the sensor itself plus the labor to dismount the tire, install the sensor, and reseal and balance the wheel. Because sensors age together, when one fails the others are often close behind, so some owners choose to replace all four at once to avoid repeat visits. We will give you an honest assessment of how many actually need replacing.
Same-Day Service
We stock sensors for most common vehicles and can program and install them the same day, often while you wait. We also reset and relearn the system so your dashboard reads correctly before you leave.
Fix Your TPMS at Tire Geeks
Do not drive around with the pressure light on. Visit 3020 Florin Rd or 2245 Arden Way, or call (916) 800-8786, and we will diagnose and fix it fast.
