Catalytic converter: Equipment in the exhaust system that transforms the contaminant gases radiated by the car.
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It is made up of a special ceramic filter that, if there are any contaminant gases, transforms them chemically into gases that are less harmful, such as carbon dioxide, nitrogen and water vapor. It usually reaches very high temperatures. Its usage is mandatory by law.
Vehicle vibrates and it's giving a p0138 cord I changed the catalytic and the O2 sensor but the check engine light comes back with the code. My rmp is at 0 when idle.