Why the Light Comes On
- Temperature Drops: Tire pressure decreases by ~1 psi for every 10°F drop in temperature.
- Tire Leaks: Slow leaks or punctures may also trigger the warning.
- Natural Air Loss: Tires lose air over time, even without damage.
What to Do When the Warning Light Activates
Pull Over Safely:
- Stop at the earliest safe opportunity.
Check Tire Pressure:
- Use a tire pressure gauge or go to a gas station with air service.
- Compare readings to the manufacturer’s recommended cold-tire pressure (found in the owner’s manual or driver’s doorjamb).
Inflate Tires if Needed:
- Add air until the pressure matches the recommended level.
- Don’t overinflate—this can also impact performance.
Monitor the Light:
- If the light turns off, your tires are likely fine.
- If it stays on, recheck the pressure or look for signs of damage.
Don’t Ignore It:
- Underinflated tires can reduce fuel efficiency, impair handling, and increase the risk of a blowout.
Regular Maintenance Tips
- Monthly Pressure Checks: TPMS is a warning tool, not a substitute for regular maintenance.
- Check Cold Tires: Measure pressure after the car has been parked for at least 3 hours.
- Rotate Tires Regularly: Promotes even wear and accurate TPMS readings.
Understanding Tire-Pressure Monitoring Systems (TPMS)
- Direct Systems:
- Use sensors inside each tire to monitor pressure.
- Sensors are often attached to the valve stem.
- Indirect Systems:
- Monitor wheel speed using ABS sensors to detect differences in tire rotation (indicating pressure changes).
FAQs About TPMS
1. If I Get New Tires, Do I Need New Sensors?
- Not Always: Sensors are reusable if in good condition.
- Battery Life: Sensors typically last about 10 years and may need replacement when their battery dies.
2. How Much Do TPMS Sensors Cost?
- Standard Sensors: $45–$65 each.
- Luxury/Niche Vehicles: Rarely, specialized sensors may cost hundreds.
3. Can I Drive with the TPMS Light On?
- Yes, but carefully: Check your tire pressure as soon as possible to avoid potential risks.
Takeaway
The TPMS light is a helpful safety feature. When it activates:
- Don’t panic but check your tires promptly.
- Perform regular maintenance to avoid unnecessary alerts.
- Address issues like leaks or low pressure to maintain safe driving conditions.
Stay safe on the road!
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