A8L Quattro Sedan W12-6.0L (BSB) (2005)
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Remove bolts - arrows -.
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Remove upper part of left air filter housing.
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Remove air duct - 1 -.
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Remove bolts - arrows -.
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Remove lower part of left air filter housing.
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Separate electrical connector - 1 - for Heated Oxygen Sensor (HO2S) 3 (-G285-).
‹› Disregard the other items in the illustration.
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Expose electrical wiring to oxygen sensor.
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Remove Heated Oxygen Sensor (HO2S) 3 (-G285-) - arrow 1 - using ring spanner set (3337).