The answer options
- To reduce the fire risk
- To reduce engine wear
- To increase fuel consumption
- To reduce harmful exhaust gasesCorrect
Why that is the answer
A catalytic converter is fitted to a vehicle's exhaust system to reduce the amount of toxic gases and pollutants released into the atmosphere. It works by converting harmful emissions, such as carbon monoxide, into less dangerous substances before they leave the tailpipe. It does not reduce engine wear or fire risks, nor is it designed to alter fuel consumption. Keeping your exhaust system in good condition helps protect the environment, as highlighted in DVSA guidance.
How this comes up in the real test
Questions from safety and your vehicle appear throughout the 50-question multiple-choice section, and the wording changes between versions. Learn the rule rather than the sentence: the DVSA can ask the same point from the opposite direction, and a memorised answer falls over the moment the phrasing moves.
The pass mark is 43 out of 50, so seven wrong answers is your entire margin. If a whole category is shaky, run the topic practice below until you are getting every question right for the right reason, then go back to full mocks under the clock.
More safety and your vehicle questions
- A vehicle MOT test will include an exhaust emissions test. What is the reason for this?
- Before leaving your vehicle unattended, what should you remove from it?
- How can drivers help the environment?
- How can driving in a fuel-efficient manner help protect the environment?
- How can the volume of traffic on roads be reduced?
- How can you avoid wasting fuel?