GELUOXI 14828-AA060 Secondary Air Injection Pump Replacement for 2007-2008 Subaru Forester XT TURBO EJ255 2007 Impreza STI EJ257 2007 Subaru WRX EJ255#14828-AA030 14828AA060 14828AA030

The role of the secondary air pump: The secondary air system is used for exhaust gas reprocessing in the engine warm-up phase.

During this process, fresh air is directly blown into the exhaust manifold, which can heat the exhaust gas catalyst converter (exhaust heat after combustion) faster.

The engine controls the secondary air pump by controlling the secondary air pump relay.

The role of the secondary air pump system is that the engine sends air to the three-way catalyst when the engine is cold, so that the exhaust gas meets the secondary combustion of oxygen in the air to increase the temperature of the three-way catalyst.