So my Christmas day present from MB seems to be a new light on my 2012 C180 Saloon - an amber engine warning light on the dash. No other warning lights, no performance issues, nothing. Only recent actions were an MB service 8 weeks ago, fuelled up yesterday, and did tyre pressures today. Warranty ran out 8 weeks ago, Ho Ho Ho. Dealer is not open until Monday, so are my Christmas travel plans ruined, or is it safe to drive a planned 100 mile round trip? TIA.