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Audi Workshop Manuals > A4 Cabriolet Mk2 > Power unit > 4-cylinder engine (5-valve turbo), mechanics > Exhaust system > Secondary air system > Secondary air system - overview
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P0411. Secondary Air Injection (AIR) Solenoid Valve N112 Checking Audi A4 1.8L Eng Quattro. 1Search. Recommended Special Tools And Equipment - PDF Free Download
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Volkswagen Workshop Manuals > Touareg V8-4.2L (BHX) (2004) > Powertrain Management > Emission Control Systems > Air Injection > Air Injection Control Valve > Component Information > Testing and Inspection > Combination Valve, Checking > Page 6477
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Audi Workshop Manuals > A3 Mk1 > Power unit > 4-cylinder Engine (2-valve), Mechanical Components > Exhaust system > Secondary air system - vehicles with engine code APF > Checking secondary air inlet valve -N112