A8 Quattro Sedan V8-4.2L (BVJ) (2008)
Air Injection Control Valve: Service and Repair
Version 2
Secondary Air Injection Left Combination Valve
Removing
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Pull rear engine cover off - arrows -.
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Drain coolant. Refer to => [ Cooling System, Draining and Filling ] See: Engine, Cooling and Exhaust/Cooling System/Service and
Repair/Procedures.
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Remove left coolant pipe. Refer to => [ Left Coolant Pipe ] See: Engine, Cooling and Exhaust/Cooling System/Coolant Line/Hose/Service and
Repair/Left Coolant Pipe.
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Remove Heated Oxygen Sensor (HO2S) 2 (G108) (in front of catalytic converter).
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Remove vacuum hose - 4 - from the secondary air injection (AIR) combination valve.