What is the primary function of a catalytic converter?

The primary function of a catalytic converter is to change harmful gases produced by the engine's combustion process into less harmful substances. Catalytic converters contain catalysts that facilitate chemical reactions to convert toxic byproducts, such as carbon monoxide, nitrogen oxides, and unburned hydrocarbons, into less harmful emissions like carbon dioxide and nitrogen. This process is essential for reducing the environmental impact of vehicle emissions and is a key component in meeting regulatory standards for air quality.

The other options may touch on aspects related to vehicle performance and efficiency but do not directly reflect the main purpose of a catalytic converter. While cooling the engine is important for maintaining optimal operating temperatures, it is not the role of the catalytic converter. Similarly, increasing engine power and fuel efficiency are goals that might be achieved through various modifications and technologies but are not directly related to the function of the catalytic converter, which is solely focused on emission control.