Blocked Drains

[PsYcHe]

Yes... The D3 suffers from them as much as the D2. And they're in a similar place.

Although the electronics units are mostly in sealed boxes under the carpet, some are vulnerable to water ingress, one of which being the ingition/lock module which controls the keyless entry and start, along with the ignition barrel.

Check the drains regularly, or this module (amongst others) may be killed off.

You'll also see water coming in down the passenger side centre console as it gets into the pollen filter and through that way. You could be looking at 2 weeks in the garage drying out the carpets.