Audi Workshop Manuals > A4 Cabriolet Mk2 > Power unit > 4-cylinder engine (5-valve turbo), mechanics > Exhaust system > Secondary air system > Secondary air system - overview
1 Fault Code found - Secondary Air Injection System - PO411 - 35 NEED HELP
Secondary Air Injection Solenoid Valve N112 Replacement | Volkswagen Passat Forum
Secondary Air Injection (AIR) System
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