Is a fault here a safety issue?

Not directly, but it can lead to unreliable automatic wipers — worth fixing promptly.

Does the sensor need calibrating after refitting the cover?

Usually not, but it’s worth checking the wipers trigger correctly afterward.

Our catalog has a wide range of this part type for all popular brands and models, including VAG (VW, Audi, Škoda), Opel, Toyota, and more.

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This cover holds the rain/light sensor against the inside of the windscreen.

Our catalog has a wide range of this part type for all popular brands and models, including VAG (VW, Audi, Škoda), Opel, Toyota, and more.

Bonds or clips to the inside of the windscreen around the rain sensor.

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15–20 min install
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Yes, if it doesn’t sit flush or has shifted, it can break the sensor’s optical contact with the glass and cause erratic auto-wiper behaviour.