A3 Quattro V6-3.2L (BUB) (2008)
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Press sensor foil as shown in direction of - arrow - onto rain sensor without bubbles.
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Then remove transparent protective foil from sensor foil.
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Spray entire surface of sensor foil with cleaning solution D 009 401 04 and insert sensor in mirror base.
CAUTION!
Rain sensor must be free of inclusions and bubbles on the windshield to function properly.
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Press sensor retaining clamps on mirror base.