this starting a few weeks ago where this message would pop up on the dash randomly. i searched the forum to look for similar issues but most of them talk about the wipers not working as well. that's not the case with me. wipers and wiper fluid all work correctly. i've noticed 2 things when this happens in my car.

1. when this message pops up while driving during daylight when the headlights are normally off, it will turn my headlights on and they will stay on. i have to manually turn the switch to off to be able to turn the headlights off. the issue goes away after a restart and may come back again with the error message. it hasn't been consistent with the amount of time it takes to come on.

2. when this message comes on at night while in auto mode or manual on mode where the headlights are normally on, the dash brightness increases as if it thinks i'm driving in the day. thankfully it's not super super bright but it's still annoying to drive like that. aside from pulling over and restarting the car, i haven't found a workaround.

do i just need a new sensor?

 

Subbed I have the same issue, today was -35 out with wind chill if didn't go on. Last week it came on when it was +4 I'm at a loss. I thought it had to do with the motor warming up but it's just all over the place. I'm going to start logging it in a book since I scanned the car and no codes where found.

 

bump

 

Bump. Also getting this problem on my W212. I notice too that my high beam assist is not sensitive enough, e.g., it doesn’t dim when I’m behind someone until I’m right up behind them.

 

Did you ever find out what it was? Get this message and have switched the sensor and its still doing it.

 

The message went away when I replaced the rain/sun sensor but I had to have it programmed. Need someone with Star/Xentry or go to the dealer. It did not solve my "high beam assist is not sensitive enough" issue and I fear that is due to the much more expensive "camera" that is also up there behind the mirror on my car.