Why can't my local dealer fix my Passat CC's faulty screen wash pump?

My partner has a 2015 Passat CC which she bought almost 12 months ago with 2000 delivery miles. She has been very happy with the car until a few months ago the screen wash stopped working. She took it to our local Volkswagen dealer, where she bought the car, to have it repaired. After waiting 2.5 hours they fixed it by reloading the software. It lasted a few weeks and stopped working again, the car is now back in the garage for their fifth attempt to repair the fault

At the last visit they had the car for 10 days and changed wiring, connectors, computer and screen wash pump and it lasted four days before it died again. I realise the car is outside the six month rejection period but we've lost all confidence in the car and don't want it anymore even if they do fix it. What can we do?

Asked on 22 November 2016 by Derek

Answered by Honest John
This tends to indicate an over-reliance on computer diagnostics and lack of electro/mechanical experience by the dealer's mechanics (probably why they call them 'technicians' these days). Having experienced the problem before, I would guess that the real reason is that the tube from the washer reservoir pump to the nozzles is trapped and kinked somewhere, possibly in the bonnet hinge when the bonnet is closed.
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