A6 Quattro Sedan V8-4.2L (BVJ) (2007)
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Work procedure
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Remove bolts - arrows -.
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Remove air guides - 1 - and - 2 -.
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Remove rear engine cover - arrows -.
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Pull check valve - 1 - off from air guide hose.
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Remove air guide hose, to do so, open clips - arrows - and loosen hose clamp - 2 -.
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Open clips - arrows - and remove upper air filter housing.