What Causes the Smell of Rotten Eggs in a Car?

1 Answers
MacAlessandra
07/30/25 5:27am
The smell of rotten eggs inside a car is mainly caused by hydrogen sulfide in the exhaust. Additional details are as follows: 1. Source of the odor: The rotten egg smell in the exhaust often occurs when the car is cold or just started. At this time, the three-way catalytic converter is at a low temperature and has not reached its normal operating temperature, thus failing to perform its catalytic function, resulting in higher emissions of hydrogen sulfide. The higher the hydrogen sulfide content, the stronger the rotten egg smell. If the rotten egg smell persists for a long time and is very strong, it may indicate a problem with the three-way catalytic converter, engine oil, or the engine itself. In such cases, it is advisable to visit a professional automotive service shop for further inspection. 2. Solutions: Open the windows for ventilation to remove the odor; place bamboo charcoal bags; install a car air purifier; use tea leaves to eliminate odors.
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