My 54 plate Yaris has an intermittant engine problem. It runs fine for hundreds (sometimes thousands) of miles and will then cut out. This usually happens when giving the car a little acceleration - leaving roundabouts or inclines. The orange engine management light has been on for over two years. The garage cannot find the problem and I have had the light switched off a few times. It always comes back on although the car will be running fine. Toyota say it is the fuel management system but cann