What must be done to conclude if there is a suspected leak in the exhaust system?

To determine if there is a suspected leak in the exhaust system, having the engine running while checking the exhaust is essential. This method allows for a direct assessment of the exhaust gases being expelled from the system. With the engine in operation, any leaks will typically result in an abnormal discharge of exhaust gases, which may be easier to identify due to visible smoke, increased noise, or an unusual smell.

Inspecting only the exhaust pipe does not provide a comprehensive evaluation. While damage to the pipe may indicate a potential issue, leaks can occur at various connection points or in other components of the exhaust system, necessitating real-time observation while the engine is running.

Looking for unusual sounds can indicate a problem, but this method is not as reliable as directly checking the exhaust flow. Sounds can vary for other reasons, and without the engine running, a leak may not be audible.

Checking around the wheels is unrelated to exhaust system integrity. This area focuses on the vehicle's braking and drivetrain components, not the exhaust system, which is located further back.

Thus, running the engine while inspecting the exhaust provides a clearer picture of any leaks and ensures an accurate assessment of the exhaust system's condition.