A leaking exhaust system can:

Cause dangerous levels of carbon monoxide to build up in or around a vehicle.
Allow carbon monoxide to enter your vehicle, with potentially fatal results.
Lead to carbon monoxide poisoning.
All of the above.
Explanation

The exhaust system removes toxic gases produced by the engine. If it leaks, harmful gases like carbon monoxide (an odorless and potentially deadly gas) can enter the vehicle's cabin. This can lead to drowsiness, nausea, or even unconsciousness. If you suspect carbon monoxide exposure, stop the vehicle immediately, get fresh air, and seek emergency medical help. A leaking exhaust system is a serious hazard and should be repaired without delay. Have your exhaust system checked periodically to ensure it’s in good working condition.

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