Secondary air filter

The secondary air filter is part of the secondary air system in modern vehicles and ensures that the additional air introduced into the exhaust system is filtered. This system is primarily used in gasoline engines to reduce exhaust emissions during the cold start phase and to improve the efficiency of exhaust aftertreatment.

During a cold start, a secondary air pump supplies additional air to the exhaust manifold or exhaust system. This extra oxygen supply assists the afterburning of unburned fuel residues in the exhaust stream. As a result, the temperatures in the catalytic converter rise more quickly, leading to more efficient exhaust gas purification.

The secondary air filter ensures that only clean air enters this system. It protects the secondary air pump and air ducts from dust, dirt, and other particles. The filter elements usually consist of special filter media made of cellulose or synthetic fibers, which enable effective filtration with low air resistance.

At Autoteile Gossau, you'll find secondary air filters for numerous vehicle makes and models, both original equipment and high-quality aftermarket options. Benefit from the lowest prices in Switzerland, fast delivery, or convenient in-store pickup in Gossau with cash or card payment.