I have had a problem for nearly 2 years with my 2009 Auris TR 1.6 Valvematic which has defied all the experts. At about every 2000 miles the engine management light comes on and does not go off. The car has spent two separate days with a main dealer who tried everything under the sun to rectify the fault but without success. I have spoken to other Toyota specialists also without success. In the end out of sheer frustration I applied the old wives trick which often seems to work quite often with