What is the primary function of the secondary air injection system?

The primary function of the secondary air injection system is to heat up the catalytic converter faster. This system works by introducing additional air into the exhaust stream, particularly during cold starts, which helps promote the combustion of unburned hydrocarbons present in the exhaust gases. By supplying this extra air, the system aids in raising the temperature of the catalytic converter more quickly, allowing it to start operating effectively sooner and contribute to the reduction of emissions.

This process is critical in meeting emission standards and ensuring that vehicles operate cleanly and efficiently during their initial warm-up phases. While it indirectly supports the reduction of tailpipe emissions by enhancing the catalytic converter's effectiveness, its primary goal is to hasten the heating process of the exhaust system components. Consequently, options that focus on fuel economy or engine power do not align with the principal role of the secondary air injection system.