To reduce emissions, the secondary air injection system uses outside air pumped through the engine's exhaust system to reduce toxic emissions. (yourmechanic.com)
A car's secondary air injection system allows oxygen into the exhaust. (yourmechanic.com)
I have a 2007 Pontiac Grand Prix 3.8 V - 6, my engine light came on and the code scan said that there is a secondary air injection system incorrect air flow. (justanswer.com)