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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
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