Hi i'm driving a W204 2009 Kompressor mileage 150000 yesterday i drove from my work with a Petrol light on, and went to a garage to fill up. And i drove for a kilometer and parked the car for an hour at some open field. When i drove the car the Engine light came on. And it idle differently now, i just did the full service three days back. Its first time having a problem like this. Please help because i just called the Mechanic and he just said i should call his friend to diagnose the car and come back to him..

 

That's a good idea to get it diagnosed - see what codes come up off the DTC and then you'll have a great place to start troubleshooting.