Should tyre pressures be checked when the tyres are cold?

Yes. Manufacturer pressure figures are normally based on cold tyres because driving heats the air and raises the measured pressure.

In relation to “Should tyre pressures be checked when the tyres are cold?”, for roadworthiness questions, separate what is merely inconvenient from what could damage the engine, tyres or brakes or make the car unsafe to continue driving.

For “Should tyre pressures be checked when the tyres are cold?”, a cold start can reveal rattles, smoke, weak batteries and starting problems that disappear once the engine is warm. Feel the bonnet or check the temperature display if you specifically asked to see it cold.

For “Should tyre pressures be checked when the tyres are cold?”, use the vehicle manufacturer’s pressure figure for the relevant load, not the maximum pressure moulded into the tyre sidewall. Recheck after temperature changes or a long journey if a reading looks unusual.

For “Should tyre pressures be checked when the tyres are cold?”, the mechanical principles here are not unique to Northern Ireland, but the roadworthiness consequence is relevant to an NI driver. Use the vehicle handbook for model-specific instructions and the attached official sources — nidirect - The Highway Code for Northern Ireland, nidirect - MOT and vehicle testing, and GOV.UK - Vehicle recalls and faults — for legal or testing context. A dashboard symbol can mean different things between manufacturers, so the exact symbol and behaviour matter.

Practical next step for “Should tyre pressures be checked when the tyres are cold?”: record the warning or symptom, check the handbook and basic safe-to-check items, and arrange diagnosis if the cause is not obvious. Stop driving if there is a red warning, loss of braking/steering, severe overheating, heavy smoke, major fluid loss or any other sign the car may be unsafe.