It is the main system that helps the car to be driven. The engine derives its energy from the fuel and air mixture while the emission system makes sure that the engine is clean and clear of the exhaust gases. So in order to make sure that the fuel and emission system is in good condition, different aspects such as exhaust, fuel, cold air intake, emission, carburetors, engine control module, fram oil filters, air filter, egr valve, fuel injector, fuel pump and air pump must be kept in good condition.