The emission control system is an essential component of a car, designed to limit the release of harmful gases into the atmosphere. This includes hydrocarbons, carbon monoxide, and nitrogen oxides, which are emitted from the engine, crankcase, fuel tank, and carburetor. The emission control system works to contain these gases within a closed system, often referred to as the EVAP system. The emission control system also monitors the volume of carbon monoxide released by the vehicle while it is in motion.
This is an important factor for those looking to reduce their carbon footprint. The oxygen sensor is one component of this system, which can detect if the engine is burning too much or too little fuel. This can cause the CEL (Dashboard Engine Check Light) to indicate that the car is running too rich or too poor, or that there is a problem with the sensor itself. The exhaust manifold channels some of the exhaust gases to the intake manifold and helps lower the engine temperature and overall emissions.
The catalytic converter acts as the main emission control unit of a vehicle and traps the most harmful gases and converts them into nitrogen, water, and carbon dioxide. The DPF (Diesel Particulate Filter) can become clogged over time, leading to a failure in the emission control system. When this happens, the CEL will indicate that there is something out of tolerance in the emissions system. An emissions technician should provide information about why the vehicle failed and what repairs are necessary.
The evaporative emission control system eliminates evaporation of hydrocarbons from the fuel tank and circulates them to the combustion chamber. In addition to protecting the environment, the emission control system also helps protect public health by reducing toxins known as carcinogens. Many car manufacturers now use a secondary battery to preheat the catalytic converter as soon as the vehicle starts in order to improve its efficiency when cold. If you think you have a problem with your car's emission control system, it's best to run it before taking it for an emissions test in order to avoid any failures or retesting hassles.
Modern cars are equipped with computers that inform drivers of any faults in their emission control systems.
