2014 E350 Coupe warning light

Question by JohnZ posted 4 months 1 week ago in Mercedes-Benz

I have recently purchased a 2014 E 350 Coupe with 28500 miles

a red arrow is coming on the info center along with a warning bell 

The arrow appears to be pointing at the dash 

Goes away when the car is at a stop light then comes on again when I accelerate

I cannot find this symbol online or in the operators manual .

Does anyone know what this warning is?