Hi all , ok so what i know about cars , they have four wheels ( five with spare ) and a steering wheel and they get me from a to b !! u get the idea . ive a focus ghia est 2.0 pet ok so i keep getting this light coming on , its the engine block one , to do with the emissions system apparently. my mechanic, who is a damn good bloke, and i consider to b genuine has had the car in a couple of times and changed a couple of sensors after reading the faults on his , fault reader ? , and repaired a split rubber pipe but each time the light comes back on after a couple of trips. i dont use it much mainly weekends and it doesnt go far . but its annoying! he says it shows more than one fault so were starting with the cheapest bits to replace before thinking about cat converters and stuff. im sure im not the only one so has anyone got any suggestions on causes ? or what theyve had to do. the car seems to run fine but dont like driving it around with light on much , as im sure its on for a reason. Thanks in advance for any replies. Happy motoring.