Scouse

Hi, my yellow engine man light is on. I know it's related to the EGR so it's not detrimental to the engine, but what causes it? It came on initially last year, so I had it cleared at my local garage, but it came on again a couple of miles after. Then it disappeared by itself last June but came on again today. Any help/advice gratefully received. Sorry, its a 2.0 diesel 175bhp, 2010 model in a 120d M-sport.