Operation CHARM
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Audi
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2007
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RS4 Quattro Sedan (8EC) V8-4.2L (BNS)
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Repair and Diagnosis
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Powertrain Management
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Emission Control Systems
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Air Injection
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Service and Repair
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Procedures
Procedures
Secondary Air Injection (AIR), Servicing
The Secondary Air Injection (AIR) system heats up the engine faster, and thereby the
catalytic converter
achieves operation readiness earlier after a cold start.