A TPMS sensor an electronic item that connects to the tyre valve that can monitor in real-time the air pressure (often called PSI, pounds per square inch) inside the actual tyre.
What do they do?
The sensor will alert you via a dashboard light becoming illuminated when pressure in the tyre is too low.
Why are they important?
As low tyre pressure is not always immediately visible, being alerted from the sensor will give you a clear warning. Having low tyre pressure can result in undue wear and tear, unsafe driving or even complete tyre failure.
What to do if the TPMS warning light comes on?
If a TPMS warning light comes on, the first thing to do is to stop as soon as it is safe to do so. It is then advisable to check the tyre for any visible damage or if it is under-inflated. In the event of damage, the tyre may need to be replaced immediately. If it is under-inflated, there may be a slow puncture so it is worth trying to re-inflate the tyre. Ultimately, it is advisable to have the tyre checked by a professional as soon as possible.