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The car exhaust system has multiple purposes. First, it muffles the sound of your car, lowering noise pollution. Secondly, it increases engine performance and fuel efficiency. And last but not least, it converts the otherwise harmful emissions after they leave the engine.
The following will indicate that it is time for you to service the exhaust system:
Often all that is needed to fix the noise is a new gasket. A gasket is a thin film which sits between the connecting pipes in the exhaust system and is used to seal the connection.
Sometimes the pipes are rusted through and require replacement. An exhaust system inspection will reveal where the issue resides. It's important to regularly inspect the exhaust system as the rubber hangers holding the components can wear out due to the harsh Canadian winters and salt build up. Replacing the rubber hanger is really cheap compared to the damage that can occur when the rubbers can no longer properly support the exhaust parts, or worse, they fall off.
The muffler and resonator work together to reduce the sound of the car exhaust. A muffler consists of multiple chambers of different sizes which direct the sound waves into each other, causing them to cancel out.
The catalytic converter converts some toxic gases that are produced due to partial combustion to cleaner forms of emissions. It converts nitrogen oxides, carbon monoxide, and hydrocarbons into oxygen, nitrogen, carbon dioxide, and water. Catalytic converters are required by law in order to prevent the toxic gasses from entering the environment.
The oxygen sensor measures the exhaust gas moving through the exhaust pipes and sends the information to the car's computer, which in turn makes adjustments to maximize fuel efficiency and engine performance. Oxygen sensors have a limited lifespan, but replacing them is fairly cheap. When the oxygen sensor fails, it will cause the check engine light to illuminate.