S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Using a small screwdriver - 3 -, carefully press the Humidity Sensor (G355) - item 4 - off the cover - 1 - - arrow - and remove it upward.
Installing
Install in reverse order of removal, observing the following:
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Carefully place Humidity Sensor (G355) in side guides.
‹› The cover cannot be installed if the Humidity Sensor (G355) is not inserted correctly.
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Install the interior rearview mirror.