Three way catalytic converter (TWC)
Three way catalytic converter converts hydrocarbons (NS), carbon monoxide (SO) and nitrogen oxides (NOx), contained in the exhaust gases into carbon dioxide (CO2), nitrogen (N2), nitrogen (N2) and water vapor.
Forced crankcase ventilation system (PCV)
The PCV valve prevents crankcase gases from escaping into the atmosphere by directing them into the intake manifold.