Keeping your vehicle exhaust system in good working order is important for fuel economy, the environment and your personal safety. We will discuss later how the exhaust system operates in details however keep in mind that it usually fails, and the best way is to repair it. Your car’s exhaust system carries away the gases generated when the fuel and air are burned in the combustion chamber. These gases are toxic to humans and our environment. Frequent inspections of your exhaust system is important to providing and maintaining you and your family’s safety. Be sure there are no holes in the exhaust system or in the passenger compartment where exhaust fumes could penetrate. Let’s highlight few of the exhaust problems
i. Something Dragging
It’s common to notice exhaust pipe rust through and begin to drag on the road after hitting a hole in the road or a bump. Move to a safe area and inspect the exhaust system. It’s not a good idea to drive a vehicle with a broken exhaust pipe, fumes can filter into the passenger compartment and carbon monoxide poisoning can be caused. Wire can be used to tie up an exhaust system in a temporary situation in the case of a broken exhaust hanger.
http://www.automobileglobe.com/common-faults-with-the-automotive-exhaust-system/