The low pressure warning light won't go off. on 2004 Mini Cooper

The tyre pressure light on the dashboard will not go off all the tyre pressures are fine and I have done all the things you are suppose to do. Could someone please get back to me and tell me if there is something else I can do or could it be a mechanical problem, Thanks

Asked by for the 2004 Mini Cooper
reset button under emerg brake handle. its very small but its right there u will see and feel it.push and hold