What is the cause of the exhaust smell in the car and how to get rid of it?

If you find an exhaust smell inside the car, it means that there is something wrong with the car, so we will talk in this topic about some steps to eliminate this smell, because it causes inconvenience to the driver and passengers.
Exhaust smell spread Exhaust
system
When you smell exhaust inside the car, you must first check the exhaust system and make sure that there are no holes in the exhaust pipe, this hole may occur due to the car’s friction in a bump on the road while driving.
There may be a hole in the car body itself that causes exhaust to enter the car, so it must be ensured that the car body is intact.
The catalytic converter (environment box)
You should also check the integrity of the catalytic converter (environment box) and change it if you are sure that it is damaged, this will eliminate the smell of exhaust.  
The smell of raw fuel
If the smell of fuel spreads inside the car, you must immediately check the fuel connections that connect the fuel tank to the engine and make sure that there are no leaks in it.
After checking the fuel connections and making sure they are safe, change the fuel filter, as it may have been clogged, causing this smell.
Which causes the smell of fuel as well. Repeated attempts to start the engine cause the fuel pumps to fill and sink. This causes a strong fuel smell inside the car. In this case, you must stop the engine and make sure that the fuel and fuel pump connections are intact before trying to start it again.