Skip the auto shop - Our mechanics make house calls

Q: Sulfuric smell coming from car

asked by on

I detect a sulfuric smell coming from the catalytic converter.

Hi there. The smell of rotten eggs is due to a compound called hydrogen sulfide. This comes from the small amount of sulfur that is present in the fuel. Normally, the sulfur is converted to sulfur dioxide, which has no odor. When the converter breaks or the filtering layers have worn down inside the converter, the sulfur is not transformed into the odorless form. Therefore, a strong rotten egg smell is produced. Another possible cause for this smell may be that the converter is plugged. Unfortunately, you cannot repair it, which means you need to have the converter completely replaced. I would have a technician from your mechanic replace the catalytic converter to get rid of the smell.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Can you give me a quote on replacing a catalytic converter for my vehicle?

Billing question sent to CS for the cost to replace the catalytic converter on a 2004 Hyundai Santa Fe.

Q: Hear clicking sound while driving

Hello. A clicking sound while driving can be caused by a number of issues. It can be a small rock stuck in the tire tread or it can be something more serious. If the noise goes away when you hit...

Q: Gas pedal pressed to floor before car accelerates

Hello, we will be happy to assist you. I would suggest that you have a technician use a capable scan tool to perform a function test on the vehicle. Doing so will test most of the sensors on the vehicle...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...