Mercedes CLK radar sensor error

I had a similar issue with my CLK. Check if the sensor is dirty. It's a common cause for sensor malfunction and driving assistance failures.

Where exactly is the radar sensor located? And how difficult is it to clean? Is radar calibration necessary afterwards?

It's usually behind the front bumper. Cleaning isn't too hard, but be gentle. If the error persists, it might need professional attention at a workshop.

Thanks for the advice. Turns out the sensor was indeed dirty. Cleaned it, and the error disappeared. Cost me 45€ for the cleaning supplies. I appreciate the help!