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VW A4: Secondary Air Injection (SAI) Pump Relay (100) Location

Secondary Air Injection Pump System Operation and Diagnosis - VW Passat Audi A4 A6 Mercedes Benz

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Code P0410 P0411 P0412 Secondary Air Injection "Test this First"

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Principle of the Secondary Air System

Audi S4 A8 4.2 P1411 P1423 Secondary Air Insufficient Flow