A tyre-pressure light that stays on after you have topped the tyres up is not being stubborn for no reason. It is reporting one of four things, and the order to check them in runs from the simplest and most likely to the one that needs a garage.
First: are the pressures actually right?
The warning clears only when every monitored tyre is up to its target, so the usual reason it lingers is that one is still low. Set all four to the placard figure, per correct tyre pressure, and include the spare if the car monitors it. A tyre that keeps dropping back down is leaking, covered under a tyre that keeps losing pressure.
Second: does it need resetting?
With pressures confirmed, some cars clear themselves after a few miles; others need a reset or relearn, particularly after a tyre change or rotation. The procedure varies by car and by system type, set out under resetting the TPMS light and the difference between direct and indirect systems.
Third: a flashing light means a fault
There is one pattern that changes everything. A light that flashes for about a minute at startup and then stays solid is signalling a system fault, not low pressure, most often a sensor whose battery has died after several years. The pressures may be fine. This one needs a garage with the right tool to read which sensor has failed, and what the system is for in the first place is covered under the tyre-pressure monitoring system.
Don't tune it out
Because the commonest cause is a genuinely soft tyre, the light should never just be ignored. Check the pressures first, every time. Only once they are confirmed correct is a stubborn light an electronics matter rather than a safety one.
Give the system the correct starting information
An indirect system may need calibration and a specified drive after pressures are set, while a direct system may require relearning sensor identities. These are vehicle-specific procedures. Note any flashing sequence or message and tell the garage about recent work. A sensor fault does not mean pressure can be ignored, and correct pressure does not prove the electronics are sound. Diagnose the remaining issue once the tyre condition is established.
Common questions
Why is my tyre pressure light still on after filling the tyres?+
Most often because at least one tyre is still below its target, since the warning clears only once every tyre is up to pressure. Set all of them, including the spare if it is monitored, to the placard figure. If they are correct and the light stays on, the system likely needs a reset or has a sensor fault.
How do I reset the TPMS light?+
It depends on the car. Some clear themselves after a few miles once pressures are right; others need a reset button held or a relearn procedure, especially after a tyre change. The steps for each type are covered in the dedicated reset guide.
Why is my TPMS light flashing?+
A light that flashes for a minute or so at startup, then stays solid, signals a system fault rather than simply low pressure, often a sensor whose battery has died. The pressures may be perfectly fine. This needs a garage with the right tool to read which sensor is at fault.
Can I drive with the TPMS light on?+
You can, but you should not ignore it. The safe response is to check all four pressures at the first opportunity, because the most common reason for the light is a genuinely soft tyre. Only once the pressures are confirmed correct is a persistent light an electronics issue rather than a safety one.