What should be checked in a vehicle's exhaust system?

In a vehicle's exhaust system, checking for any leaks is crucial because leaks can allow harmful gases, such as carbon monoxide, to enter the cabin area, posing serious health risks to the occupants. Carbon monoxide is a colorless, odorless gas that can be lethal in high concentrations, making its detection critical for ensuring passenger safety. An effective exhaust system should keep all gases directed outside the vehicle, preventing their entry into the passenger compartment.

Focusing solely on the color of exhaust fumes, the sound of the exhaust, or inspecting only the condition of the exhaust pipe does not address the primary safety concerns that could arise from leaks. While those aspects can indicate certain issues, they do not provide a comprehensive assessment of the potential dangers that leaks can pose. Therefore, checking for leaks stands out as the most important and safety-oriented aspect in evaluating a vehicle's exhaust system.