Why would you want to deactivate?

It's a safety warning if a tyre is going flat, you should always reset after checking tyre pressures.

What you do is check tyre pressures, then set to activate and drive the car slowly and it sets itself, that's all you do.

Be aware that wheel spinning/fast cornering can fool it and it will give a warning.

Personally I think it a great safety feature

Daves right Emily.

You activate it everytime you change the tyre pressures. Activate it while stationary then drive off and it sets itself up. Takes a few seconds.

So Remember to go through the activation process next time you drive the car as it wont be calibrated correctly if you didn't drive it on this occasion. And remember to do this every time you change a tyre or pump up your tyres.