problem with s500
b)Rotten egg smell is normally due to H2SO4 or sulphuric acid. Even if it was the catalytic converter the smell should not enter the passenger compartment.
c)Have your vents intake checked. Maybe someone dropped a stink bomb in it
d)Finally (its a looong shot) but can it be a rotten charcol filter?
Thats all I can think of at the moment.



