A6 Quattro Sedan V8-4.2L (BVJ) (2007)
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Remove pin from spreader clips - 4 -.
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Remove the air filter lower section and disconnect the connector - 2 - on the rear side at the Intake Air Switch-Over Valve (N335).
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Disconnect air guide hose - 3 - to Secondary Air Injection (AIR) pump.
Installing
Observe the following to ensure the Mass Air Flow (MAF) Sensor (G70) functions correctly.
‹› If the air filter element is very dirty or soaked, dirt particles or moisture may have contaminated the Mass Air Flow (MAF) Sensor (G70) and may
be causing false mass air flow values. This results in a reduction of power, since a lower injection quantity is calculated.
‹› Always use an original equipment air filter element.
‹› Use a lubricant (silicone-free) for installing the intake hose.
‹› Secure all hose connections using hose clamps appropriate for the model type:
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Check water drain hose in lower section of air filter for dirt and contamination (clean if necessary).
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Clean air filter housing (upper and lower sections) of salt residue, dirt or leaves (use vacuum cleaner if necessary).
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Check the MAF sensor and intake hose (intake air side) for salt residue, dirt, and leaves.
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Check the intake ducting up to the air filter element for dirt.
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Make sure that air filter element is properly centered when placed into the mounting of the lower section of air filter housing.
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Set the upper section of air filter housing onto lower section of air filter housing, without using much force. When doing this, make sure that the
upper section of air filter housing is not placed crooked onto the air filter element. Pay attention to the sealing lip of the air filter element (false
air).
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Then, fasten the upper section of air filter housing to lower section of air filter housing.
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Further installation is performed in reverse order.
