Warning lights or messages, faulty parts. The tire pressure monitoring system (TPMS) monitors tire pressure and indicates when the pressure is low and needs to be addressed. The TPMS system can malfunction. For example, the warning light may turn on, flash, and then turn off. If your tires have low pressure (if you check them manually) but the TPMS the warning light did not turn on, then then the TPMS can have faulty parts (sensors). It is not recommended to drive vehicles with faulty TPMS because of the risk of driving with underinflated tires. Besides potential flat tires, driving tires with low pressure can potentially lead to other issues.