Air Injection System: Notes

This system helps reduce hydrocarbon (HC) and carbon monoxide (CO) exhaust emissions by injecting air into the exhaust system. The induction of additional air promotes further oxidation (combustion) of unburned and partially burned exhaust gases. During cold engine operation, air is injected into exhaust manifold. This quickly warms up catalytic converter and O2 sensor. When vehicle warms up, air is diverted to atmosphere or, on models with a TWC/OC, to the catalytic converter. See CATALYTIC CONVERTER  .