Dashboard light yellow circle flashes when engine is switched on

Did you check the owner's manual? I would do this for you but Cooper motors doesn't allow free access to the owners manuals on line, you must buy them.

hi this is the warning light for brake pad wear sensors have your brakes checked for wear or broken sensor wires

front brake pads need replacing NOW.......(think about how brake shoes work.....)

check the water level in the radiator it appears the low coolant lamp is on for the reason of low coolant

Are refer to the Brake System; in RED and YELLOW condition, continue driving cautiously:





More details about this Warning Lights you can find in the 2003 Mini Cooper - Owners Manual (page 16 and next).

I really hope helps with this (remember rated this help) Good luck.

BRAKES! Replace your brakes NOW. You have less than 2MM of pad lining on (most likely) your front brake pads. No brakes, no stop. No stop, no MINI.

That should be your handbrake light

if that "Circle" is a sort of round-bent arrow shape around "!" mark, you either have ASC or DSC disabled manually (by pressing the "DSC" button on your console", or there is a problem with the system.
Take your to the dealer. Specialized MINI/BMW computer should be able to diagnose it right away. Can be a costly repair

Just talked to a mate of mine who said its the ASC that has been turned off. I flicked the ASC switch and problem solved.

If it is yellow and looks like a tire it is the flat tire light, and you should check his tire pressure. if it is a yellow triangle with an arrow going around the triangle with a exclamation point in the middle this is your DSC or ASC and if it is on all the time these features are inactive and you should hit the DSC/ASC toggle switch to the right of the drivers window switch. If this symbol just flashes briefly this means the DSC/ASC is presently activating. thest are the tow that I can think of, I hope this helps.