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Maine Class C Permit Practice Test
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Vehicle Safety, Documents & TowingStandalone practice
Why must a suspected exhaust leak be checked even when occupants do not notice an unusual smell?
Correct answer: Carbon monoxide in exhaust is poisonous and odorless
Why
Carbon monoxide is a poisonous, odorless gas in engine exhaust. A leaking exhaust system can expose occupants, so have a suspected leak checked and corrected. Do not use the absence of an odor as proof of safety. Vehicle maintenance protects occupants as well as preventing breakdowns.
Verified against Maine Driver License Manual and Motorist Handbook, Rev. 4/24 · Exhaust leaks and carbon monoxide · p. 21
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