Since November 2014, all new cars sold in the UK must be fitted with a Tyre Pressure Monitoring System (TPMS). If you've seen a horseshoe-shaped symbol with an exclamation mark illuminate on your dashboard, your TPMS is alerting you to a problem that needs attention.
What the TPMS Warning Means
The warning typically activates when one or more tyres are 25% or more below their recommended pressure. This could mean a slow puncture, a tyre damaged by a pothole, a faulty valve, or simply natural pressure loss over time. Direct TPMS systems (the more informative type) can tell you exactly which tyre is affected and display the precise pressure — check your dashboard display or vehicle handbook.
What to Do When the Light Comes On
Don't panic, but do take action promptly. Check all four tyre pressures as soon as it is safe to do so — many petrol stations have air machines with pressure gauges. Inflate any under-inflated tyre to the correct specification. If the light goes out after inflating, the immediate problem is resolved, but monitor that tyre closely for recurrence, which would suggest a slow puncture requiring repair.
TPMS System Service
TPMS sensors have battery-powered transmitters in the wheel, which typically last 7–10 years before the battery fails. When a mobile tyre fitter replaces your tyres, they should check and reset or replace the TPMS sensors as appropriate. If the warning light remains on after inflating all tyres correctly, the sensor itself may need replacing — something Pegasus Mobile Tyres can assist with across West Yorkshire.
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