Operation CHARM
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Audi
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2004
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S4 Cabriolet (8H7) V8-4.2L (BHF)
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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 Precautions
Air Injection: Service Precautions
Secondary Air System
The Secondary Air Injection (AIR) system causes the
catalytic converter
to heat up more quickly, resulting in earlier operating readiness following cold start.