What are the risks of driving a vehicle with a leaking engine exhaust system?

1. Engine over-heating.
2. Correct answer: The penetration of burnt gases to the passenger compartment, which might cause loss of consciousness.
3. It might harm nearby vehicles.
4. There is no risk in driving a vehicle with a leaking emission system.

WhyIf the exhaust leaks, burnt gases can get into the passenger compartment and cause loss of consciousness.