It is not that dangerous to drive with a faulty catalytic converter. Your can will still drive well when a portion of the catalytic converter is connected. You will hardly notice the difference. However, it is recommended to get the vehicle checked immediately you realize that the catalytic converter has a problem. Accumulation of sulfur in the cabin is harmful to the health of the occupants. When the engine is burning too much oil or running for long, it can burn through the catalytic converter's fiber. Driving your vehicle faster at this stage may lead to the production of smoke. The smoke will enter the cabin through the vents. A clogged catalytic converter might cause the car's engine to overheat, which can be disastrous. Refer to your owner's manual for the recommended repair and replacement procedures for the catalytic converter. When your engine misfires, it is a sign of catalytic converter failure. If you discover the sources of the rotten egg smell, you won't have to perform any major cleaning on your car to remove it. The scent will go away once you have found and fixed the catalytic converter. Proper conversion of hydrogen sulfide to odorless sulfur dioxide will eliminate the smell. Before heading to the technician to diagnose your vehicle, you should first ensure that the smell is not coming from rotten fruit or pieces of food in your vehicle. To do this, check your vehicle's interior, especially under the seats. If this fails, you can take your vehicle for a thorough check-up of the catalytic converter and transmission oil.