Posts Tagged: secondary air injection pump

Secondary air injection pump trouble code

What is secondary air and what is an AIR pump? Secondary air is known as an air injection reaction system (AIR). It’s designed to reduce emissions during cold startup. The system consist of an air pump (like a small compressor) a one way valve, and a solenoid valve. The purpose of this pump is to inject air directly into the exhaust manifold during a cold start to complete the combustion process. At cold startup, the computer commands a rich mixture. The extra air from the AIR pump helps oxidize the … Read More