Steve Taxi
Senior Member
We have had an intermittent bad egg smell in two W211 E Class cars over the last 6 months and having searched here and suspected both stinky air con and smelly cat/converters it turned out to be something much simpler and cheaper, the washer fluid was stagnant and as the filler to the bottle is beside the air con intake it was getting into the cabins. Emptied them out, put in some disinfectant, topped up and the problem has gone, if you have a smelly W211 this could be your problem.