I've got this problem with my w212 that it can't seem to be resolved, when i go 120 km/h on a highway or try accelarate up a hill, the engine light come on and those 2 errors seem to cause the problem.
The turbo seems fine because i already checked it into the mechanic and when i park a the car overnight the car seem to be ok
I bought the car 1 year ago and every thing went ok till a month ago, the errors for the first time appeared when i had the tank with low gasoil( we have a issue with fuel quality in my country).
I'd appraciate any suggestion