At approximately 74,000 miles the front drivers side seat belt electric extender went in and out 6 six times uncontrollably, then in the retracted position failed all together, while the seat belt itself remained in the slack position and would not retract. This malfunction left the front drivers seat belt useless, a huge safety risk and violates Colorado seat belt law. There are thousands of documented complaints in multiple model and years of the same issue with Mercedes Benz seat belts as published online. The local Mercedes Benz dealer states this is not a consumer serviceable item, and Mercedes Benz service bulletin passes off their manufacturer defect as the consumers fault for "soiling the seat belt and not keeping it clean" which is rubbish. Mercedes Benz dealer quote to replace the entire seat belt system front driver side only, $900. Front passenger side starting to malfunction, rear passenger side not fully retracting when exiting the vehicle. The local dealer did not offer a loaner car as I had to wait two weeks for them to "schedule me in" for the repair, thus driving an unsafe vehicle during the two week waiting period.

- Parker, CO, USA

Seat belt extended without tension and continued to release. So the driver side seat belt was of no functional use. Brought to Mercedes service, replaced entire seat-belt and retraction system. Was told the wheel that retracts the belt is defective. Seems like a real safety issue, maybe when someone needs there belt, this will occur, and the result will not be a service call, this should be fixed by Mercedes...

- Chagrin Falls, OH, USA