Major rust in the welded joints of the Steel subframe. Long crack development along the seams, could have led to catastrophic lost of control of vehicle if the breaks were not found. This is an apparent flaw with the C-Class Mercedes Benz and quite surprising to the Service Reps at my dealership that this has not been a recall issue, as they-??ve replaced many. The repair is quite costly, over $5,000. There were no symptoms, warnings or messages. This was found when the vehicle was in for a 10k service. I have a video sent by the technician that show the inspection of the vehicle.

- Germantown , MD, USA

I was driving my 2012 Mercedes C250 through an intersection on 08/09/2021 when I first heard clunking noises in the rear of my vehicle. Every time I placed my foot on the brakes after that it continued to clunk until I took it to the Mercedes dealership for repair on 08/17/2021. The car had about 57,000 miles on it and was only nine years old, but the dealership said that the entire rear subframe of the vehicle had rusted and was close to completely separating from other parts of the vehicle. This was the first time I heard of any rusting in my vehicle, despite having the 2 rear tires replaced and alignment by the same place on 10/02/2020 (less than one year before). The service rep acknowledged that the car was well-maintained and that this was not due to any accident. This rusting was due to a manufacturing defect and has caused accidents in other Mercedes vehicles (https://). It has resulted in recalls of rusted parts in both Europe (https://europe.autonews.com/article/19981026/ANE/810260839/mercedes-offers-guarantee-against-rust-for-30-years) and Canada (https://www.wheels.ca/news/mercedes-benz-recalling-vehicles-for-rust-problems/). Had I been travelling at a higher rate of speed when this piece failed, I could have been at risk of serious injury. This event occurred without any warning lamps or messages. The service for replacement and realignment was quoted at $4,358.71. Only after much argument did I receive a final bill of $3448.71. This was an unbelievable cost for replacing a part with a manufacturer defect. Mercedes headquarters tried to claim that the issue was due to exposure to snow and salt on the roads. This region rarely gets any snow. This lack of care for customer safety along with the fact that the dealership did not retain the part they removed from my vehicle after I had requested them to do so, left me realizing that Mercedes doesn't care about safety standards for their products.

- Chevy Chase, MD, USA

The air suspension is faulty and leaks. I have had the since 2013 and the suspension has been replaced on all for wheels within days of each other. Costing thousands of dollars in parts and labor.

- Phoenix, AZ, USA