My S5 N/A has a strong gas smell during start up, but not when I pressurize the fuel system with the yellow connector. Now when I smog the car a month ago it passed barely, with HC and NOx both pretty high. FAQ suggests that the cat might need to be replaced in this case.

So I wonder if my catalytic converter is dying, would it be the cause of the gas smell?

 

like it smells like gas right after you start it cold? its totally normal, on just about any car...

 

i love my cats...

 

dieing cats usually start to rott and smell like decaying carcasses.

and to answer your question, yes.

 

yeah.. dyin cat smells like rotten eggs. ive changed alot of cats at work. whenever they come in we're like did u run over an animal? haha