Hi all, I have just taken my car in for a full service, MOT and Cam Belt change. Have driven it home and a light has come on the dash. My manual says this light is "Fault in the exhaust system - go to a qualified workshop" Whereas when I search online the same light says "Engine Emission Malfunction - bring in for service". Firstly does anyone know which is correct and secondly what does it is likely to mean? How serious and how quickly should I get it back into the garage? Thanks