Revision question · Band 2 traffic signs and signals, car control, pedestrians, mechanical knowledge

What does your vehicle's catalytic converter reduce?

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How long it takes for the engine to warm up

Damage to the engine caused by using dirty fuel

Harmful compounds in the exhaust emissions

How much noise the engine produces

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Harmful compounds in the exhaust emissionsThis was the right answer

Catalytic converters are exhaust-treatment systems that remove most of the harmful compounds from the exhaust gases. These include carbon monoxide, nitrogen oxides and hydrocarbons. The converter only deals with toxic, polluting gases; carbon dioxide is still produced.

Reviewed reading for this question

Vehicle maintenanceHighway Code annex · A catalytic converter is exhaust-treatment equipment that reduces specified harmful compounds; it does not eliminate carbon dioxide.

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