There are 2 owner-reported driver assist & adas complaints for the 2021 Mercedes-Benz S-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
The contact owns a 2021 Mercedes-Benz S580. The contact stated that while driving at 50 MPH and attempting to accelerate, the vehicle inadvertently activated the Forward Collision Avoidance feature and briefly applied the brakes hard enough for the ABS to be activated. The contact stated that there were no objects near or around the vehicle. The vehicle returned to normal functionality but had since become a regular failure. The Forward Collision Avoidance warning light was illuminated. The vehicle was taken to the dealer, who was unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was notified of the failure but offered no assistance. The failure mileage was 23,500.
Every Mercedes Benz manufactured in 2021 has a defective hood lens which prevents the adaptive driver assistance system from working properly. You can have it on and it will work intermittently which can easily cause a major crash. Mercedes Benz says the part is not available in USA or Germany. Every Mercedes is affected. I’ve been waiting over 2 months for the part. My brother, who owns the same car, has been waiting over one month. It’s a major problem because the car is suppose to self drive on the highway and it’s not staying in lane because of this defective hood lens. Hey [XXX] , I apologize for the inconvenience. There have been a few S classes with a similar message to yours. We have to order the camera lens hoods for your vehicle, but they are in back order. We don't have one in stock in the USA or Germany. I could have you stop by the dealership and clean the camera lens hood to temporarily remove the message on the dashboard. I can also order the part while the vehicle is here, and we would have to wait a few months for the part to arrive. When do you have time to stop by the dealership for a few hours? --Karen Hubschmitt - Mercedes-Benz of Brooklyn Sent from my iPhone INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026