Loud bang then the smell of bad eggs or fish?

Asked by May 23, 2017 at 07:54 PM about the 2007 Volkswagen Jetta

Question type: Maintenance & Repair

Driving on the fwy in my 2007 Jetta sedan and I hear a loud bang (like a tire popping) and then the smell of rotten eggs or fish, car seems to run fine, however check engine light came on (diagnostic said "a leak" most likely loose gas cap, and exhaust light also came on and went off?  Any thoughts out there?

1 Answer


The bang could have been from the catalytic convertors, Hydrogen sulfide (the rotten egg smell) builds up from the sulfur in the fuel you are using in the converter. The converter might be plugged up. Unburnt fuel is one of the main culprits. Have the fuel system checked, like the regulator and or the injectors.

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