Tyre pressure light on but tyres look fine? Check, set and reset

Updated 23 July 2026 · OBDCode UK editorial

Tyres can look normal while significantly underinflated. Set all pressures cold to the door-jamb or handbook figure, inspect for damage, then use the vehicle’s reset/calibration procedure. A light returning within days suggests a leak; a flashing light often indicates a system fault.

Can you keep driving?

Stop if a tyre is visibly low, damaged, bulged or the car pulls/handles abnormally. Otherwise drive only after checking with an accurate gauge. Do not reset the system to a known-wrong pressure.

Match what the car is doing

What you notice	Most likely	How to separate it
Light after a cold snap	Pressure drop with temperature	Set cold pressures; do not use the tyre sidewall maximum.
Light returns after a few days	Slow puncture, valve or rim leak	Soap/leak test and tyre inspection.
Light after new tyres	Missed calibration, damaged sensor or relearn needed	Identify direct vs indirect TPMS and follow the correct relearn.
Light flashes then stays on	Sensor/module communication fault	TPMS-capable scan identifies the missing wheel/sensor.

Checks to do before buying parts

Measure all four tyres cold with a reliable gauge; check the spare if monitored.
Inspect tread and sidewalls for nails, cracking and bulges.
Set the correct load-specific pressure, then reset/calibrate.
If it returns, ask for leak location and sensor ID rather than another reset.

Typical UK costs

Likely job	Typical fitted price
Pressure correction	£0–£5
Puncture repair where safe	£20–£40
Direct TPMS sensor fitted	£40–£100
Tyre replacement	£60–£200+ each

Indicative 2026 independent-garage prices for mainstream cars; London, prestige, SUV and seized-part jobs can cost more. Diagnose first.

MOT relevance

For vehicles first used on or after 1 January 2012, a malfunctioning TPMS can be a Major defect. Tyre damage, tread and inflation-related safety remain separate test concerns.

Tools that help with this check

Topdon OBD2 scannersTopdon diagnostic scanners with full-system readouts
XTOOL diagnostic toolsXTOOL code readers for petrol and diesel cars
Autel UK testersAutel professional-grade diagnostic testers

Frequently asked questions

Why won’t the tyre pressure light go off after inflating?

The system may need a manual reset or driving relearn, pressure may still be wrong, or a direct sensor may have failed.

Can cold weather turn on the TPMS light?

Yes. Pressure falls as temperature drops, often exposing tyres that were already near the threshold. Measure and correct rather than simply resetting.

Sources and further reading

General guidance for UK drivers, not professional advice. MOT rules follow the DVSA inspection manual (2026 edition).