i put some valve cleaner (petrol additive) in at the weekend for the first time ( don't ask me why ) - apart from a slight petrol smell in the car since , it seemed to be running a bit cleaner .... this morning however on my way to work the OBD malfunction indicator lamp ( emission control system ) came on solid ... coincidence ? or should i drive screaming to my nearest Subaru dealer and hand over my wallet ?? or has the CAT just packed up ?? it was MOT'd just last week and emissions were fine ..... any ideas ?