Q:

Why does my car exhaust smell like sulfur?

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Quick Answer

A smell of sulfur coming from a car's exhaust pipe is a good sign that there is a problem with the catalytic converter, according to Cars Direct. The smell, similar to rotten eggs, indicates that the sulfur present in gasoline is not being converted to odorless sulfur dioxide.

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Why does my car exhaust smell like sulfur?
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Full Answer

Two other possible causes of a sulfurous smell are a broken fuel pressure regulator and an engine that is running at too high of a temperature. If the fuel pressure regulator is the problem, it can easily be fixed with the installation of a new fuel filter.

If the smell is due to a problem with the car's converter, the converter itself cannot be repaired and has to be replaced.

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