A8 Quattro Sedan V8-4.2L (BVJ) (2008)
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Disconnect electrical connector.
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Press clip - 2 - outward at - arrows -, for example, with a small screwdriver.
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Remove the clip - 2 - from retaining plate - 1 -.
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Remove rain sensor - 3 - from mirror base.
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A sensor foil remains affixed to the windshield.
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If the same windshield is reinstalled, remove this completely from the windshield.
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Clean the surface with cleaning solution D 009 401 04.
Installing Rain Sensor
‹› If the same rain sensor is reinstalled, proceed as described.
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Remove the rest of the sensor foil from the rain sensor, if necessary.
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Carefully peel sensor foil - 2 - from rain sensor - 1 -.
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Clean the surface with cleaning solution D 009 401 04.
CAUTION!
Sensor surface must be completely free of foil remnants.
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Peel silicon paper - 3 - from sensor foil - 2 -.