2013 S550. Replace Grill with aftermarket Grille. Distronic is giving me errors on the mirrors and the adaptive cruise control doesn't work. I don't know if it is just a coincidence or if the new grille is causing the problem. I cleaned all the sensors as called for in the manual.

 

Probably just a coincidence, the plate on the grill is just protective.

 

I removed the aftermarket grille and drove the car, the distronic work as it should. I put the old grille back on and it still worked. I reinstalled the aftermarket grille and it didn't work. I guess it is not sending the radar or whatever through the new grille. they look the same but it doesn't work with the new grille.

 

Yes you're correct. I believe there's elements in the paint that block the sensor.