Which is a sign that an exhaust system is in disrepair?

A loud vibration is indeed a sign that an exhaust system may be in disrepair. This vibration can indicate that there is a break or loose component in the exhaust system, which can affect its functionality and efficiency. When the exhaust system is not properly secured or if there are cracks or holes, it can lead to unwanted vibrations as the exhaust gases exit the system.

Additionally, vibrations can also signal that engine components, such as the mounting brackets or rubber hangers, are failing. Maintaining a properly functioning exhaust system is crucial, as it ensures that gases are expelled correctly and minimizes their effects on vehicle performance and passenger comfort.

While other options might suggest issues with a vehicle, they do not specifically indicate problems with the exhaust system like a loud vibration does. For example, a faint odor of gas could relate to fuel system issues, excessive heat might suggest cooling system failures, and increased fuel consumption can result from various factors, including engine inefficiency or air filter problems.