My TPMS system shows a warning when the car is cold, but disappears when it is warm. Should I inflate the tyres more to avoid this?

I have a Toyota Yaris Cross and recently the in-car tyre pressure readout keeps showing a number of tyres as being below the required pressure.
However, after driving the car for a while, the tyre pressure warning light disappears indicating that, once warmed up, the tyres are indeed within the correct pressure range.
Should I inflate the tyres to slightly above the recommended levels to avoid the warning light or is it best to maintain the pressures at the handbook stated levels?
The problem I foresee is that, if I do have a tyre that is truly losing pressure, I may ignore it due to the initial readings.

Asked on 28 November 2023 by Graham Cowperthwaite

Answered by David Ross

As you explained, tyre pressures will increase slightly once on the move as the air within them increases in temperature. We would suggest setting the pressures when the tyres are warm, as increasing the pressure to give an accurate reading when cold may mean they are overinflated when warm. However, most vehicles give tyre pressures for varying loads and speeds, so as long as your tyres are within the two extremes you should not encounter any issues.

Tags: temperature tyre pressures tpms

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