Hi there, thanks for adding me! We've had our 2016 X-Trail for just under 2 years and I noticed water coming in under the dash on the drivers side. Nissan looked at it and said it's the sunroof drain leaking, but want nearly £700 to diagnose and fix it. Has anyone else had this problem? Is there anything we can do ourselves to try and clear it? It may be that the drains are perished but I would like to try before spending that much money! Appreciate any advice, thanks.

Hi....welcome to the Club

The simplest and most effective and also the cheapest option is to but yourself a Smoke Generator which will instantly identify where the leak is coming from.

https://www.ebay.co.uk/itm/315502976341?itmmeta=01KEGZPWYGJ259PS400VMKP27X&hash=item4975715d55

All you need to do is place it in the area where the leak is coming from and unlike water (which tracks to the lowest point from where it is leaking) the smoke goes directly out of the point of entry of the leak.
At a cost of £65 and it is something you can do yourself then it negates paying £700 for the diagnosis and more than likely you can repair it yourself.

Let us know how you get on with it