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Where is the problem when a car smells like rotten eggs?

2 Answers

DiSawyer

07/29/25 12:02am

The rotten egg smell inside the car is mainly caused by hydrogen sulfide in the exhaust. Below is some information about automatic detection of unqualified exhaust on highways: 1. Cylinder wear: There is a large amount of carbon deposits and tar, and the three-way catalytic converter and oxygen sensor have failed. Check the air filter, spark plugs, intake air temperature sensor, intake pipe pressure sensor, and add dual-core anti-wear repair agent and high-efficiency cleaner. If ineffective, use a three-way catalytic converter cleaner to clean the three-way catalytic converter. It may be due to insufficient oxygen supply in the intake system, cylinder wear, or carbon deposits in the cylinder. 2. Solution: The three-way catalyst and front oxygen sensor, incomplete combustion of the engine's air-fuel mixture will generate a large amount of carbon deposits. Therefore, cleaning the three-way catalytic converter and oxygen sensor will solve many problems of unqualified vehicle exhaust. If the fuel quality is problematic, the sulfur, lead, and phosphorus contained in the fuel can cause three-way catalyst poisoning, leading to the failure of the three-way catalytic converter.

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MacJuliet

08/12/25 4:19am

I've driven quite a few cars before, and when encountering a rotten egg smell in the car, it's usually due to a problem with the catalytic converter. The catalytic converter is a component in the exhaust pipe responsible for treating harmful elements in the exhaust gases. If it's damaged or clogged, it releases hydrogen sulfide gas, which smells just as disgusting as a rotten egg. This is no joke—I recommend stopping the car immediately for inspection. Definitely don't keep driving around, as prolonged inhalation could be harmful to health. Another common cause is a leaking battery, especially in older cars with aging batteries, where the electrolyte can leak out and produce this odor. You should open the windows for ventilation and then head to a repair shop. Professionals will use tools to diagnose the issue, preventing small problems from becoming big ones. Regular vehicle maintenance can truly prevent problems before they arise, saving money and giving peace of mind.

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