Hi I have an 06 ford focus hatchback 1.6 turbo diesel car. Last week a red light showed on the left hand side of the dash. It is a red ! with a red cog around it. Have had it in the garage all week. they put it on computer but no faults codes shown up at all... changed EGR valve but that didn't make a difference. The car is in limp mode. Sometimes the light might not come on for ten minutes and until it does the car drives fine and when light comes on it goes back to limp mode again.
Any advice would be great