Had my FL 1 TD4 for nearly a year now. Love it to bits, sorted all niggles except orange engine management light. On and off. When its on, I have no change in performance. Engine performance is always very good whether the light is on or off. Got rid of the light for a long time (about 2k miles) by replacing vacuum hoses and cleaning the EGR. Light now mostly on, though will sometimes go off for long periods. Only factor that stops me thinking its just a spurious error is that it will allways go off either briefly or for longer periods, after hitting 4000 revs? Code reader says no stored faults. Any ideas anyone?