Your Tire Pressure Monitoring System warning light goes off when a tire is 25 percent under inflated. If your recommended pressure is 32 psi, 25 percent below means you are at 24 psi; which is severely under inflated. At that low pressure, your safety is at risk, your fuel economy is hurt, and your tire is wearing out too fast. Check your pressure at least once a month. At Greenhaven Shell in Sacramento we install quality NAPA replacement parts. Give us a call at 916.422.6053 and let us help keep you safely and economically on the road.