Car Smells Like Rotten Eggs

Rotten Egg Smell In Car | Car Smells Like Rotten Eggs | How to Remove Rotten Eggs Smell From Car

Car Smells Like Rotten Eggs?

Generally, no one likes the strong presence of an unpleasant or particularly potent smell. When driving, your car battery smells like rotten eggs is often an indicator of a serious issue.

Car smells like rotten eggs battery mostly this smell comes from the small amount of hydrogen sulfide, or sulfur, within the fuel. Hydrogen sulfide is a prime source of odor in the car that is usually converted into odorless sulfur dioxide.

However, when some parts of a system leak or break within the vehicle’s fuel or exhaust system, it can inhibit this process and create a smell.

A car battery smells like rotten eggs when the leftover by-products and deposits burn up due to incomplete combustion. The following are some of the top reasons for this problem to happen and what you need to do about it.

Read More: Rotten Egg Smell In House & How To Remove it

Why Does Car Smell Like Rotten Eggs

A rotten Egg Smell Coming from the Car due to the following reasons,

1. Broken Catalytic Converter

Car Smells Like Rotten Eggs Battery
Broken Catalytic Converter

The most probable reason for a rotten egg smell, the catalytic converter is part of the vehicle’s emissions system. As the gasoline reaches the catalytic converter, the converter transforms the trace amounts of hydrogen sulfide into odorless sulfur dioxide.

Its main function is to reduce harmful emissions by “converting” exhaust gases, like hydrogen sulfide, into harmless gases. Sometimes broken or jammed catalytic converter cannot properly process the sulfur gases and will cause your car to smell like rotten eggs.

If it is found that the catalytic converter is the cause of the smell, you need a new catalytic converter. If there are no signs of physical damage, another vehicle component has caused it to fail and needs repair.

2. Failing Fuel Pressure Sensor or Worn Out Fuel Filter

Car Smells Like Rotten Eggs Battery
Worn Out Fuel Filter

The main function of the fuel pressure sensor regulates the use of fuel in a vehicle. If the fuel pressure regulator fails, it ends up clogging the catalytic converter with too much oil.

Sometimes too much oil prevents the converter from processing all exhaust byproducts, which then exits the vehicle through the tailpipe and produce the rotten egg odor.

More than the required amount of byproducts can also build up within the catalytic converter and cause it to overheat, also contributing to the smell.

Read More: First Home Checklist – Before You Buy (2020)

3. Old Transmission Fluid

Car Smells Like Rotten Eggs Battery
Old Transmission Fluid

Sometimes, when you missed too many transmission flushes, the fluid may begin to leak into other systems and unleash a rotten egg smell.

This mainly occurs in manual cars, changing transmission fluid as suggested by your car’s manufacturer can often solve the problem.

How to Remove Rotten Eggs Smell From Car?

The best method to remove the rotten egg smell from your car is to replace the faulty part causing the smell.

This could be done by replacing the catalytic converter, fuel pressure regulator, fuel filter, or even old transmission fluid. As the damaged part gets replaced, the smell should disappear.

It is also important to look around for any off or bad smells surrounding your vehicle. Moreover, the sulfuric odors may be because smoking or burning smells can indicate serious issues like an overheating engine, a fluid leak, or worn-out brake pads.

Always take the advice of expert mechanics when it comes to diagnosing and repairing vehicle components.


What causes a rotten egg smell in a car?

The most common cause of a rotten egg smell in a car is a malfunctioning catalytic converter. The catalytic converter is responsible for converting harmful gases from the engine into less harmful emissions. When it is not functioning properly, it can cause sulfur to build up in the exhaust system, resulting in a rotten egg smell.

Can I still drive my car with a rotten egg smell?

It is not recommended to continue driving your car with a rotten egg smell, especially if the smell is strong. It is important to get the underlying issue fixed as soon as possible to prevent any potential damage to the vehicle or harm to yourself.

Can I fix the rotten egg smell in my car myself?

Depending on the cause of the smell, some fixes may be possible to do yourself, such as replacing a faulty battery or cleaning the car’s interior. However, if the issue is with the catalytic converter or another part of the exhaust system, it is best to leave the repairs to a professional mechanic.

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