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Home >> Audi >> 2016 >> S4 Premium Plus, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (4.2L - Engine Mechanical, Engine Code(S): BNS) >> 26 - Exhaust system, Emission controls >> Secondary Air Injection (AIR), servicing >> Secondary Air Injection (AIR), servicing

Secondary Air Injection (AIR), servicing

WARNING: This page is about a different car, the 2008 Audi RS 4 and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

The Secondary Air Injection (AIR) system heats up the engine faster, and thereby the catalytic converter achieves operation readiness earlier after a cold start.

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