If the vehicle fails to warn the driver of low tire pressure, driving the vehicle may result in tire tread separation, increasing the risk of a crash.
The Tire Pressure Monitoring System (TPMS) may be incorrectly set and thus may not illuminate the warning on the instrument panel when a tire's pressure is 25% below the recommended cold inflation pressure. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 138, "Tire Pressure Monitoring Systems."
What to do: Book it in at your next service. There is no deadline and no charge.