SRS malfunction for front left seat message popped up recently. On further investigation by a mechanic is was found that the error code was 9B51 which mean that the front left seat belt buckle needs to be replaced. The problem with this issue is(as explained by the mechanic) that in an event of a crash the airbag will not deploy, which is pretty serious. Although I was still under the factory warranty for miles (50,000) my years with the car was above their year limit(4 years). I have seen exactly the same issue being reported by many Benz C300 year 2008+ owners reporting this issue in many forums online and there's a mention of this issue to NHTSA as well.

- Waltham, MA, USA