XSeries-forum

When I picked the car up the auto wipers seemed to work after a fashion but the sensor didn't seem to be quite right, yesterday when it rained they just didn't sense the rain at all so I had a look at the sensor from outside and there seems to be what look like large bubbles under the windscreen.

Is it fairly easy to remove the sensor and re-glue it to the screen, I see there are pads for sale but I can't imagine how you can get the bubbles out when you re-fit the sensor so I didn't want to waste my time! Anyone done it?

Someone on here used fishtank sealant before. Please do a search before taking my word for it

This is on an e46 but the same thing i would think.
https://www.youtube.com/watch?v=QyX56gXW7_U

I'll have a watch in my lunch break, thanks

You need to use an optically clear sealant if trying to bond the sensor back in the OEM way as the sensor shines an IR light at the screen and measures the return.  Water droplets change it and trigger the system.  Bubbles as you have found just mess it up.

Make sure that the interior surface of the glass is spotless and dust free.