this is my first benz . i got it at a lien sale for a good price. she runs rough and i am using a innova 1500 obd2 scanner and am recieving po300 ,po308 ,po305-07 &06. [ have replaced coils and spark plugs and still comes up same codes

 

Hello and welcome to the forum! Are you able to clear the codes with that OBD2 scanner or does it just read them? I think you may need a MB specific scan tool to clear the codes from coming back. Please let us know if you have any other questions or if we can assist with any future part needs.