I had the same problem occur two weeks ago, offside washer cover fell off. Luckily I managed to find the broken cover. The plastic locating hook on the underside of the cover had snapped off. Its not a very robust fitting or well designed.
Booked into dealers for it to be replaced under warranty. Judging by other notices I have read, this seems to be a common fault, although when i asked the dealer they would not admit to it.
So all Z owners who have this washer system fitted, keep an eye on your covers.
Booked into dealers for it to be replaced under warranty. Judging by other notices I have read, this seems to be a common fault, although when i asked the dealer they would not admit to it.
So all Z owners who have this washer system fitted, keep an eye on your covers.