[myboris]

Light has come on dash board but no visible signs of a puncture, car not handling any different, checked all tyre pressure and one is down by a couple of PSI. Could that be it or would the pressure be right down? I've had weight in the boot either.

[Russbmw]

If one is lower than the others, then that is why the car has flagged it up. It warns of a pressure loss - it doesn't only come on when the tyre has lost all pressure, as that would be a little late!

It's an early warning system designed to let you know to drive more carefully on your run-flat tyres.

Pump it up to what it should be, reset the monitor as per the handbook, and see what happens.

[myboris]

Originally Posted by Russbmw

If one is lower than the others, then that is why the car has flagged it up.

Pump it up to what it should be, reset the monitor as per the handbook, and see what happens.

Ahh cheers for that

[Digitalize]

Usually takes around 10PSI difference on the same axle before it goes off in my experience.