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What's causing my Audi A3's electric windows and central locking to malfunction?

The electric windows on my Audi A3 V-reg are only working on one side. I can't see anything wrong with it but also the central locking only opens the driver's door, and then the alarm goes off.

Asked on 5 June 2010 by england2k10

Answered by Honest John
This model is prone to moisture ingress to the control ECU.
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