Why is my tyre pressure warning light on?
The TPMS (tyre pressure monitoring system) warning light means one or more tyres are significantly under-inflated, or a sensor has failed. Check your tyre pressures at a petrol station immediately — under-inflated tyres affect handling and fuel economy, and can cause a blowout at speed. If pressures are all correct and the light stays on, a TPMS sensor may have failed.
Likely causes
Under-inflated tyre(s)
Check all four tyres at a petrol station — including the spare if fitted with a sensor
Slow puncture
A nail or screw causing gradual pressure loss
Faulty TPMS sensor
Sensors have a battery life of 5–10 years — older cars are more prone to sensor failure
Recent tyre change without sensor reset
Sensors need recalibrating after a tyre change
Repairs you may need
Typical cost range: £5–£180 — Inflating tyres costs nothing. Puncture repair £10–30. TPMS sensor replacement £50–180 per sensor.
Got a quote for this repair?
Check every line in 60 seconds — labour hours, parts prices, and regional rates.
Check My Quote Free