Audi VW ECU water damage, 2011 Q7 3.0 tdi, 90k miles.

[colinbryant]

After recent very cold, wet, weather ('beast from the East'), got a bunch of warning lights and fault codes including 'throttle position sensor circuit', 'stabilization program', 'automatic suspension' and a couple of other random ones. Audi eventually diagnosed ECU failure - and the throttle died on me driving home from diagnosis - rapid deceleration to tickover when pulling on to a roundabout.
Got the ECU replaced at a cost of £1600.

Opened up the ECU and found a small amount of corrosion internally around the vent plug and a corresponding spot of corrosion on the circuit board immediately below that point.

The perimeter sealing is very strong but the vent plug is not an air-tight fit because there is an atmospheric air pressure sensor in there.
Photos uploaded showing vent plug corrosion and close up of Circuit board damage. Bosch couldn't repair it.

2 short video clips at:

https://youtu.be/lWPL17JdaPc
https://youtu.be/3VY5GMq1tQY