I'm new here! Had Rio diesel for 4 years. Check light came on a week ago (which has never happened before) so stopped on the motorway and RAC were brilliant, coding it P0401 which means prob need EGR valve or sensor or just clean away the soot and grime. Hereset itand thecheck light hasn't appeared until today. Can I still drive the car without causing complications such as damage to cat converter? I need the car for work until I can book the car into the garage.