The check engine is yellow and oil is red on my 08 Xb12Ss. My check engine used to come on quite frequently and it took me a while to discover the problem. Everytime after the wife went with me for a ride the weight of use both pushed down on the battery cables causing the positive to wiggle a little loose. The next day by myself the light would flicker on and by the third the bike was ready to die. I re-tightened the terminal and that would work until the next ride with the wife. I later changed the spiget washer to a lock washer and haven't had the problem since.