It is a common problem with micra's. It is an engine warning light, to fix it you must take your micra to a garadge, they will reset the car to its former state! after a short time after the orange light goes on the micra will go into 'go home mode' which will enable you to drinve your car or will limit you to 20mph/
Usually 70 pound for resettting whih only takes 2 mins for garadge to do , bit of a rip off
louise, December 2008